Erro ao tentar instalar ADT plugin

Alguem poderia me ajudar, to tentando instalar o ADT 20.0 no meu ecplipse helios, porém quando vou adicionar software, seleciono o ADT, dou o next, ele me apresenta esses logs de erro. Acho que pode ser conflito de algo que já esteje instalado, mas nao sei o que fazer :S…

Cannot complete the install because of a conflicting dependency.
Software being installed: Android DDMS 20.0.0.v201206242043-391819 (com.android.ide.eclipse.ddms.feature.group 20.0.0.v201206242043-391819)
Software currently installed: Eclipse IDE for Java EE Developers 1.3.1.20100916-1202 (epp.package.jee 1.3.1.20100916-1202)
Only one of the following can be installed at once:
Eclipse UI 3.6.1.M20100826-1330 (org.eclipse.ui 3.6.1.M20100826-1330)
Eclipse UI 3.6.2.M20110203-1100 (org.eclipse.ui 3.6.2.M20110203-1100)
Eclipse UI 3.6.0.I20100603-1100 (org.eclipse.ui 3.6.0.I20100603-1100)
Cannot satisfy dependency:
From: Android DDMS 20.0.0.v201206242043-391819 (com.android.ide.eclipse.ddms.feature.group 20.0.0.v201206242043-391819)
To: org.eclipse.ui 3.6.2
Cannot satisfy dependency:
From: Eclipse IDE for Java EE Developers 1.3.1.20100916-1202 (epp.package.jee 1.3.1.20100916-1202)
To: org.eclipse.epp.package.jee.feature.feature.group [1.3.1.20100916-1202]
Cannot satisfy dependency:
From: Java EE IDE Feature 1.3.1.20100916-1202 (org.eclipse.epp.package.jee.feature.feature.group 1.3.1.20100916-1202)
To: org.eclipse.platform.feature.group [3.6.1.r361_v20100909-9gF78GrkFqw7GrsZnvz0JWNTeb6fue6896L]
Cannot satisfy dependency:
From: Eclipse Platform 3.6.1.r361_v20100909-9gF78GrkFqw7GrsZnvz0JWNTeb6fue6896L (org.eclipse.platform.feature.group 3.6.1.r361_v20100909-9gF78GrkFqw7GrsZnvz0JWNTeb6fue6896L)
To: org.eclipse.rcp.feature.group [3.6.1.r361_v20100827-9OArFLdFjY-ThSQXmKvKz0_T]
Cannot satisfy dependency:
From: Eclipse RCP 3.6.1.r361_v20100827-9OArFLdFjY-ThSQXmKvKz0_T (org.eclipse.rcp.feature.group 3.6.1.r361_v20100827-9OArFLdFjY-ThSQXmKvKz0_T)
To: org.eclipse.ui [3.6.1.M20100826-1330]

Eu seleciono o Android DDMS e o Android Development Tools . dae da esse erro que falei, se eu desmarcar o DDMS ai vai… faz falta esse DDMS?

Esse ddms é o monitor do debugger. Sem ele você não vê a saída que a aplicação escreve. Aconselho você a instalar o adt 18. Eu desenvolvo com ele e não peguei nenhum bug até agora.