Let's try this:
Unregister and re-register the mshtml.dll and then check if you come across the issue.
Step 1:
a. Click on Start.
b. Click on Run and then type
regsvr32 /u mshtml.dllc. Click on OK.
Step 2:
a. Click on Start.
b. Click on Run, type:
regsvr32 mshtml.dllc. Click OK.
Let me know if that was successful!
The hotfix mentioned here might work:
http://support.microsoft.com/?kbid=281679