I placed window XP compact disc. can I newly do fix window or I must restart it resembling bright?

Answer:

you can fix it, if u put it within and restart ur computer. Use the boot from cd option, and next select repair windows
Depends on what the issue is. Most of the time you can repair the window installation, but if the issue is sever enough and you do not own anything on the notebook that you would miss, just restore it resembling new.
Pardon?
You can do a reinstallation of XP which will save your programs and settings untouched. If you're in XP and insert the setup disk, you can choose to do a reinstall or verbs install.
you can repair with out reinstaling, or merely do the upgrade and you won't loose anything.
well first of adjectives the question is not clear whether the window is corrupted or some dll is missing or a virus attack .

well you can restore window ... or place windows compact disc and scan system files to restore system files by sfc scan now command i.e sfc /scannow. otherwise animate your windows