The version of WordPerfect you are running isn't compatible with Windows 7. Try running the program compatibility troubleshooter.
Here is what I found in the Compatibility Center: http://www.microsoft.com/windows/compatibility/windows-7/en-us/Search.aspx?type=Software&s=Wordperfect
I installed wordperfect 11 on my new Dell with Windows 7 and have been working on wordperfect 11 docs. I tried to Save As a doc and it simply won't respond. I tried other wordperfect docs, same result