|thanks for the reply|
i system restored my pc and it worked think the problem was that i uninstalled 10 or so softwares from the add or remove app .
after i 'system restored" my pc it was fine then i again uninstalled softwares and the problem came up again. i "system restored" for the second time and didn't unnstall programs and now there is no problem.
i recommend uninstalling software from uninstall.exe file in program files folder if you want to remove many softwares at a time.