Recently, I had some rather intense problems with my dell dimension 4600 to the point I had to completely reinstall windows xp and everything else on my computer.  After wards, everything has seemed just fine.  However, my system restore program now will not collect any restore points what so ever.  I have tried manually setting a restore point myself, as well as letting the computer collect ones of its own from time to time too.  I have checked the settings on system restore, and it is turned on and available memory for it is set to the max.