[jitter] jitter java support error: could not find jvm

hi all,

I have a problem with one Windows PC where jitter java support doesn't want to work.
The System is a XP Machine which first didn't have SP2 installed
I installed SP2, then the actual Sun JRE 6u1 (The Java Installer told me that SP2 is required).

I have the same JRE on an identical Hardware (XP SP2 was already installed there) and Jitter java support runs fine there.

Does anybody have an idea?

thanks
secco