ERRO NO ECLIPSE. Me ajudem!

Pessoal, tinha instalado o o jdk 1.5 e voltei para o 1.4 e nao entra mais no eclipse dando o erro abaixo. Que erro é esse… Me ajudem por favor!!

!SESSION 2007-02-07 11:27:34.000 -----------------------------------------------
eclipse.buildId=M20060921-0945
java.version=1.4.2_13
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=pt_BR
Command-line arguments: -os win32 -ws win32 -arch x86

!ENTRY org.eclipse.update.configurator 4 0 2007-02-07 11:27:35.906
!MESSAGE FrameworkEvent.ERROR
!STACK 0
org.osgi.framework.BundleException: Exception in org.eclipse.update.internal.configurator.ConfigurationActivator.start() of bundle org.eclipse.update.configurator.
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:1010)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:966)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:317)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:329)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1037)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:573)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:495)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:275)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:455)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:189)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:291)
Caused by: org.eclipse.core.runtime.CoreException: Cannot create configuration in file:/C:/eclipse/configuration/
at org.eclipse.update.internal.configurator.Utils.newCoreException(Utils.java:85)
at org.eclipse.update.internal.configurator.ConfigurationActivator.initialize(ConfigurationActivator.java:113)
at org.eclipse.update.internal.configurator.ConfigurationActivator.start(ConfigurationActivator.java:71)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:991)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:985)
… 10 more
Root exception:
org.eclipse.core.runtime.CoreException: Cannot create configuration in file:/C:/eclipse/configuration/
at org.eclipse.update.internal.configurator.Utils.newCoreException(Utils.java:85)
at org.eclipse.update.internal.configurator.ConfigurationActivator.initialize(ConfigurationActivator.java:113)
at org.eclipse.update.internal.configurator.ConfigurationActivator.start(ConfigurationActivator.java:71)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:991)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:985)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:966)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:317)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:329)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1037)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:573)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:495)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:275)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:455)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:189)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:291)

!ENTRY org.eclipse.core.runtime 4 0 2007-02-07 11:27:35.906
!MESSAGE FrameworkEvent.ERROR
!STACK 0
org.osgi.framework.BundleException: The bundle could not be resolved. Reason: Missing Constraint: Require-Bundle: org.eclipse.core.jobs; bundle-version="[3.2.0,4.0.0)"
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:294)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:329)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1037)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:573)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:495)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:275)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:455)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:189)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:291)

!ENTRY org.eclipse.osgi 4 0 2007-02-07 11:27:35.906
!MESSAGE Bundle initial@reference:file:plugins/org.eclipse.update.configurator_3.2.1.v20092006.jar/ [2] is not active.

!ENTRY org.eclipse.osgi 4 0 2007-02-07 11:27:35.906
!MESSAGE Bundle initial@reference:file:plugins/org.eclipse.core.runtime_3.2.0.v20060603.jar/ was not resolved.

!ENTRY org.eclipse.osgi 4 0 2007-02-07 11:27:35.921
!MESSAGE Application error
!STACK 1
java.lang.IllegalStateException: Unable to acquire application service. Ensure that the org.eclipse.core.runtime bundle is resolved and started (see config.ini).
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:65)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

!ENTRY org.eclipse.osgi 2 0 2007-02-07 11:27:35.921
!MESSAGE One or more bundles are not resolved because the following root constraints are not resolved:
!SUBENTRY 1 org.eclipse.osgi 2 0 2007-02-07 11:27:35.921
!MESSAGE Bundle initial@reference:file:plugins/org.eclipse.core.runtime_3.2.0.v20060603.jar/ was not resolved.
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.core.jobs_[3.2.0,4.0.0).
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.core.contenttype_[3.2.0,4.0.0).
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.equinox.preferences_[3.2.0,4.0.0).
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.equinox.registry_[3.2.0,4.0.0).

!ENTRY org.eclipse.osgi 2 0 2007-02-07 11:27:35.921
!MESSAGE The following is a complete list of bundles which are not resolved, see the prior log entry for the root cause if it exists:
!SUBENTRY 1 org.eclipse.osgi 2 0 2007-02-07 11:27:35.921
!MESSAGE Bundle initial@reference:file:plugins/org.eclipse.core.runtime_3.2.0.v20060603.jar/ [3] was not resolved.
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.core.jobs_[3.2.0,4.0.0).
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.equinox.registry_[3.2.0,4.0.0).
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.equinox.preferences_[3.2.0,4.0.0).
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing required bundle org.eclipse.core.contenttype_[3.2.0,4.0.0).
!SUBENTRY 2 org.eclipse.core.runtime 2 0 2007-02-07 11:27:35.921
!MESSAGE Missing optionally required bundle org.eclipse.core.runtime.compatibility.auth_[3.2.0,4.0.0).

Tenta pegar o eclipse novamente. Veja se no eclipse.ini tem alguma coisa identificando a versao da jdk.
Só por curiosidade, pq vc fez issoo??

no eclipse.ini so contem isso:
-vmargs
-Xms40m
-Xmx256m

. tenho outra maquina(y) aqui ao lado. que com a mesma pasta do eclispe(da maquina x q ta dando pau) e o jdk 1.4.2.13 tb instalado nao dar erro algum. Será q tem lixo do 1.5

eu tinha colocado umas bibliotecas (jar) da pasta JWSDP para jdk \lib\ext e jre\lib\ext na versao 1.4. ele nao aceita issso. Aceita somente na versao 1.5