Thanks guys! I have the GUI version, so I'll do just that.
Now what's this about how it only works when nothing else is and only when you're logged on? I (now) have 2 XP machines (the old one was W2K Pro) and each one has two XP accounts: one for me, one for my daughter. We always leave email and Firefox and sometimes a game (like Petz) running, does that mean Folding isn't going to run?
Firefox has no problem coexisting with F@H. Some games will block F@H but these are mostly older games, especially DOS games in a Window.
To find out, run all the programs that you like, open the Task Manager and select the Processes tab. At the bottom of the Task Manager you will see the CPU usage, and inside the Processes you will se the CPU column showing how much each program (process) is actually using.
I keep a F@H GUI. a F@H console and Opera open all day, plus lots of other stuff. When I type in Opera I will see the program use maybe 5% - 10%. The rest of the CPU usage is dedicated to F@H.
The GUI version runs only when you're logged on. If you leave both accounts logged on, and switch between them using "fast user switching", or something like that, it will remain active all the time.
As far as working when nothing else is, that's a bit of a misinterpretation, due to some people saying it's like a screen-saver. It can be used as a screen-saver, but that governs only what it displays. It is always running in the backgroud, using whatever CPU power is available. However, since it runs at such a low priority, it should never take CPU cycles away from something you're actively working on.