well system restore is not a solution of every thing though...
Try under Safe Mode...
While you are just about to enter Windows Booting menu, press
F8 will give you option for Safe mode boot up, use that to boot in to safe mode try from there !!
also Visit your Start menu folder through Windows Explorer.... the localiot would be,
• %SystemRoot%\Profiles\user_name\Start menu\Programs
• %SystemRoot%\Profiles\Default user\Start menu\Programs