To give an answer to garnet, why reinstalling the system helped:
The longer you're working with Windows, the more residu of opened files clutter up your harddisk. Even cleaning up and defragmenting does not clean up your disk entirly. Process tamer will then not be able to get a fix on where exactly it should look for the process to tame, because it gets mystified by windows. Reinstalling solves this problem.
For me Process tamer does a nice job in taming CPU usage, but there is another problem in your system that it doesn't handle and wich can and will make your system become slow and "not responding" and that is if you use many programms at the same time or after one another windows takes a lot of time of cleaning up the threads and in the worst case create a stack overflow in the GDI resources thus rendering your system to be nonresponding. Adding a Ramcontroller helps out for a while, but a reboot does a better job.