Has value '1.4', but '1.5' is required

Alguém sabe o por quê desta msg?

Registry key ‘Software\JavaSoft\Java Runtime Environment\CurrentVersion’
has value ‘1.4’, but ‘1.5’ is required.
Error: could not find java.dll
Error: could not find Java 2 Runtime Environment.

Nao consigo fazer nada por conta disto.
Instalei o java 1.5, nao entendo porque isto está acontecendo.

Luciana