Terminal Server 2003 msiexec high cpu usage, hp upd

Ok, so this has been killing me for a while. I have a terminal server that was unable to add/remove applications in a timely manor; when I say timely, I mean TIMELY! It could take days to install Office, or HOURS to install a security patch.

I still haven't fully isolated what causes the problem to start (possibly bad printer driver). But this solution worked for me this time.

I removed these Registry Keys; which were full of HP garbage.

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\Install\RefHive\Hewlett-Packard]
[HKEY_USERS\.DEFAULT\Software\Hewlett-Packard]
[HKEY_CURRENT_USER\Software\Hewlett-Packard]

I then made sure that there were no Universal Print monitors.

[HLKM\SYSTEM\CONTROLSET001\CONTROL\Print\Monitors]
[HLKM\SYSTEM\CURRENTONTROLSET\CONTROL\Print\Monitors]

References:
http://forums11.itrc.hp.com/service/forums/bizsupport/questionanswer.do?threadId=1247687
http://forums11.itrc.hp.com/service/forums/bizsupport/questionanswer.do?admit=109447626+1264044137399+28353475&threadId=968215