How do I recover an SBS 2003 server from the installation of IE7 before SP2?

I have recently (two days ago) updated an SBS 2003 server to IE7, SP2, and SP2 for Exchange. Ever since, the network performance and remote access have been slow, and in the case of remote access, unreliable.

I have since discovered in another question on EE that IE7 must not be installed before SP2 (thank you TechSoEasy), but as I did indeed install the former before the latter how can I restore the server to its previous happy state? Initially I uninstalled two IE7 updates and then  IE7 itself - this seemed to go OK, so I then tried to uninstall SP2. This failed with a "could not find specified file" error.

I am now very reluctant to proceed without wise counsel as I don't want to damage the installation any further. Should I re-install IE7 and its two updates, and then try to uninstall SP2, followed by IE7?
The server runs a sophisticated accounting and tax management program, and everyone is noticing that it is now running dog slow.

I would very much appreciate advice as to what I should do next.
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PerarduaadastraAsked:
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PerarduaadastraConnect With a Mentor Author Commented:
I've discovered the cause of the problem. Apparently, among other things, SP2 for Windows 2003 Server changes the Offload Checksum settings in the NIC drivers. I've explicitly disabled them on the server in question, and it's business as usual again. What made it tricky for me to discover was that only one application (unfortunately the client's core program) was affected; everything else continued to work normally. The IE7 issue proved to be a red herring.
My thanks to Badotz for his interest, but I arrived at the solution by another route.
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BadotzCommented:
Did you make a restore point before you installed IE7 and/or SP 2 ? If so, you might try restoring to an earlier point in time.
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