The procedure entry point_except_handler4_common could not be located in the dynamic link library msvcrt.dll
This error is caused by a 3rd party utility or applcation overwriting your msvcrt.dll with a different version.
For example if a windows vista version of this DLL was copied on to a windows XP computer you would probably get this error.
A solution to this problem can be found in Microsofts KB
http://support.microsoft.com/kb/324762