i think you may have to re-register some dll's
Click Start > Run
Enter each of these one by one and click OK.
regsvr32 jscript.dll
regsvr32 vbscript.dll
regsvr32 /i mshtml.dll
Emsa Register Dll Tool and Register/ Unregister OCX/DLL Utility
are two utilities, with which you can achieve the same on the fly.
More some addl help please refer Microsoft Support.