If you are using Window XP operating system may encounter some unknown problem such as can’t open up task manager,edit registry or using right click menu,you can try ‘XP Quick Fix Plus‘ to help you fix the problem.
XP Quick Fix Plus
integrates 40 common Windows XP problems fixes which is portable and small tool.
Download XP Quick Fix Plus and unzipped,run ‘ lfx.exe ‘,
Then select the unknown problem that need to fix and click it,that all.