JigPu's User Opinion Follows:
RAIN is not a good program. I was trying to OC my pentium 90 and decided to add Rain. Everythiing went fine (except the overclock

) I decided to keep it installed just to keep the CPU cooler. A few days later, my computer slowed WAY down! I figured it might be because of the OC and I wrote a post about it. People said I might have corupted the registry and suggested a format. I reformated and reinstalled (I still had rain). I restarted to finalize all my settings, and guess what? The computer STILL ran slow! I thought it might now be something acting up. I formatted again and re installed windows. I didn't install anything else and it ran perfectly. I slowly added programs, each time running a benchmark to make sure my comp wasn't running slower. As soon as I installed and opened Rain, the computer slowed down again. Removing the program fixed the problem. I personaly don't like Rain anymore because of this. I would suggest going with Waterfall or CPUIdle ANYTHING BUT RAIN!. I didn't try either of the other two out, but they (I hope) can't be any worse than Rain.
End User Opinion:
JigPu