Hello daniel_eller,
Clear temp files, and temporary internet files.
Empty your IE cache and your other temporary file folders, eg: c:\temp,
c:\windows\temp
or C:\Documents and Settings\<name>\Local Settings\Temp (the path to your
temp folder will change depending on your name) - sometimes programmes can be
hidden in there - watch out for mysterious *.exe files or *.dll files in
those fºlders.
http://www.mvps.org/winhelp2002/delcache.htm
One possibility is that the downloaded installer file is corrupt.
And then download a fresh copy
of the installer by following the download links from
http://www.microsoft.com/spyware/
Then try running the new installer.
Did you also clear the OS temp folder? One way to do this is with Disk
Cleanup--Start, all programs, accessories, system tools, disk cleanup.
Any chance of getting a copy of the download file via a different ISP--on a
CD from another machine, for example?
You are saving the file locally before running it? I know this seems inane,
since otherwise it is simply run from the TIF, but it seems to make a
difference.
Good luck
Engel