Corrupt file apparently causing multiple issues.

When uninstalling Outlook 2000 from an Office install, a notification popped
up stating that the mssign32.dll file was corrupted. (I believe it was this
file, I dismissed it as we have had similar issues in the past where chkdsk
worked.) So I restarted the computer and CHKDSK ran, found the problem with
the file, and stated that it was corrected. When I logged back into Windows
and started to navigate to the Outlook 2007 location on our network, I
noticed that the left side bar where common tasks are located was completely
blacked out except for the task links. Then when I try to install Outlook
2007, the osetup.dll cannot be loaded. The install works fine on other
machines. Thanks for the help.

Recap:
-Windows XP SP2 w/ updates
-Uninstalled Outlook 2000
-Corrupted mssign32.dll
-Chkdsk says it repaired
-Blacked out Common Task area
-Unable to install Outlook 2007 due to inability to load osetup.dll