i've unexpectedly deleted some important files from my system.Is there any way to recover that files....??..??

Answer 1

If you have not deleted them from the Recycle Bin, they may still be there.

If not, right-click on the Recycle Bin and click on the Unerase Wizard - and hope for the best.

If this is unsuccessful, try:
http://search.yahoo.com/search?ei=utf-8&fr=slv8-fp&p=recover%20deleted%20files

and take your pick.