Rebooting does help, but I do not do it daily. Rebooting does help with performance to a point. Many programs have memory leaks and after 3-4 days you will see you memory slowly increase in usage. When I reboot and start folding, my memory will show around 33% usage. In 3-4 days aftering surfing, doing finances, playing a few games, my memory will show up around 50-65% usage when folding. Part of the problem is windows, part of it is the way some programs are written. I have one game I still play that when it first came out, you had to reboot every 12 hours because it had so many memory leaks, memory usage would hit 100%. It has since been fixed, but I still try and reboot about once a week.