Repair/Reinstall mshtml.dll

I’m facing some serious problem with my Outlook Express on Windows XP. Whenever I try to print a normal email also it crashes with the following error message:

Error Signature:
AppName: msimn.exe
App Version: 6.0.2900.5512
ModName: mshtml.dll
Mod Version: 8.0.6001.18372
Offset: 002149F0

I though system restore can fix the problem but no. It even crashes in the Safe mode. Any idea what is wrong? DO I need to re-install the same again? If yes, what about my backup.

It seems like i have fixed the problem. When i was searching Google for this issue i came through various articles which says the problem is actually with Internet Explorer and not the Outlook. So far i was using Firefox. What is did id download IE and overwritten my IE7. Doing this seems like it has repaired the mshtml.dll. And now there is no more problem with printing emails from Outlook Express.