whats the longest time u didn't formated your pc?

3 years. I know many things about computers and i can manage to have mine run smoothly even without often formatting. You can do this using utilities that clean registry and get rid of temporary files, also by using a good antivirus to prevent viruses from wandering in the hard drive. I only formatted that time cos i had to change motherboard, if there wasnt such reason i wouldnt format.

I have 4 systems but for resolving the problem I don't prefer to format the hard disc. I try to first troubleshooting then go to scan the systems eventhough the problem doesn't resolve then I have to format that.

1 year too as sometimes to remove some Trojan horses or virus it's only possible when you formated your pc.

na i formt my computer reguraly because of congestion and some virus. once in a month is good for me. i only format one drive which is for only windows and my softwares. i regulary tweak my computer so i end up getting up messed up with them so sometimes i have to format

Probably like two years. I have images of the hard drive stored though just in case.