Win 2000 Pro damaged by AOL install?

Someone tried to install AOL 5.0, which failed, then AOL 7.0 on my Windows 2000 Pro machine. It started locking things up and screens like Add/Remove Programs, Control Panel, and Print dialog either don’t appear or appear incompletely. I managed to uninstall all the AOL files (I think) from the AOL Uninstall program and have rebooted but the damage is done. I’m afraid I need to reinstall Windows, but I have some local networking settings to my two Win 98 machines that I hate to lose.
1) Do Ineed to reinstall Windows 2000?
2) Can I specify that it just fixes broken files without wiping out my other settings?
Please reply in laymen’s terms; I do VB and SQL but I’m not very savvy on hardware and OS issues. Thanks!