What version of Outlook are you running?
Have you tried a simple detect and repair from the help menu? Also, did you
copy over a PST that was perhaps read only? Check the attributes of the file.
If you're using a PST, what is the size of the file and have you run a
ScanPST.exe against it to see if there are any issues?
The error number you posted is normally a "module not found" error (I've
seen it more frequently from Windows Update than Outlook) and I'm really not
sure what that means in regards to Outlook. Try to make sure you're running
the latest SP's and hotfixes, make sure you've also reapplied any SP's.