Hi Matt,
Take a look at SAP Note 1891797 - How to do a complete SAP GUI installation on client PC. There are some manual removal steps which should be applicable to both 7.20 and 7.30.
Install the latest SapSetup patch. This would be patch 37 as of August 7. it was released on July 29.
Confirm "Microsoft Visual C++ Redistributable runtime DLLs VS200X.." exists under programs.
Manual steps are:
Delete folder, C:\Program files\Common Files\Sap Shared, if it exists.
Delete all other folders where the sapgui was installed
C:\%program files%\sap\sapsetup
C:\%program files%\sap\Frontend
C:\%program files%\SAP\Business Explorer
C:\Document and Settings\ALL Users\Start Menu\Program\SAP Front End
C:\Document and Settings\ALL Users\Start Menu\Program\Business explorer
Delete all "SAP" entries in the windows registry in
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SharedDLLs (ONLY the SAP entries)
Hope this helps.
Cheers,
Dan Mead