You're off topic for this forum, which is dedicated to
Windows Live OneCare.
Your question may be better posed to one of the forums here, depending on your operating system. However, it sounds like you need a new drive.
Vista:
http://social.answers.microsoft.com/Forums/en-US/category/windowsvista
XP:
http://social.answers.microsoft.com/Forums/en-US/category/windowsxp
Windows 7:
http://social.answers.microsoft.com/Forums/en-US/category/windows7
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~