Should i install windows update after i have restored my computer to factory setting? I bought this PC in 2011, Does it mean my windows is up to date till 2011 if i did the restore to factory setting?
Yeah you'll want to do all the updates. It'll probably have you restored to one of the earliest versions of Windows. Windows 7 got a lot faster with newer updates, noticeably so if you go from a fresh install to fully updated.
You should have the option for windows update in the start menu. Yes install all updates available to you. I'm assuming its windows 7 with service pack 1? If its the original version of 7 without the service pack then install service pack 1 before doing any windows updates. Get sp1 from here.