one program is blocking other programs to start?

[Henk]

I installed a program for a second time but I got a message that the
evaluationperiod had expired. (Nero trialversion 8). From then some programs
won't start anymore. PCTools told me that another program is blocking their
programs. I uninstalled Nero, but that didn't resolve the problem. Curious
that Vista can't handle this. Any idea where to remove the evalution-expired
key? Is there another reason?

Henk

 

[BirgerH]

Nero makes a lot of file associations when installed, and the installer does
not clean the registry very good.
If you don't want to mess with the registry and registry cleaners, the best
way will be to reinstall the programs, you cant use anymore, hopefully this
will overwrite the Nero settings left.
It is not recommanded to clean up registry by microsoft - but certainly I do.