How often should Windows be re-installed?

[anandk]

i have been using the same xp for over 6 mnths now, and its as good as new; inspite of SO MANY installs/uninstalls/trials/etc. 6 mnths back, i messed up royally, hence had to reinstall.

tweak it to optimize it.
clear pc junk files
clean registry
compact registry
defrag hard disk.

for this i use ace utilities, tune-up utilities, system mechanic, cacheman, ms bootvis, driverheaven tunexp 1.5.

 

[mako_123]

I generall reinstall it after a month