Had a weird one over the weekend. A colleague of mine accidentally approved Internet Explorer 8 to all servers in our domain via wsus and it left our Citrix servers in a bit of a sad state. We set about removing it as soon as possible but after the uninstall / restart we were faced with this very strange problem. When we double clicked internet explorer on the desktop, the application wouldn’t launch and a new shortcut to Internet Explorer would be created on the desktop.

We also had these logged every thirty minutes or so in the event logs:

Event Type:    Error
Event Source:    Userenv
Event Category:    None
Event ID:    1041
Date:        06/09/2009
Time:        21:50:38
User:        NT AUTHORITYSYSTEM
Computer:    Computername
Description:
Windows cannot query DllName registry entry for {7B849a69-220F-451E-B3FE-2CB811AF94AE} and it will not be loaded. This is most likely caused by a faulty registration.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

And:

Event Type:    Error
Event Source:    Userenv
Event Category:    None
Event ID:    1041
Date:        06/09/2009
Time:        21:50:38
User:        NT AUTHORITYSYSTEM
Computer:    Computername
Description:
Windows cannot query DllName registry entry for {CF7639F3-ABA2-41DB-97F2-81E2C5DBFC5D} and it will not be loaded. This is most likely caused by a faulty registration.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

If you face the above problems, delete the following registry keys and open internet explorer as an administrator:

“HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinlogonGPExtensions{CF7639F3-ABA2-41DB-97F2-81E2C5DBFC5D}” /f
“HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinlogonGPExtensions{7B849a69-220F-451E-B3FE-2CB811AF94AE}” /f
“HKEY_CLASSES_ROOTCLSID{871C5380-42A0-1069-A2EA-08002B30309D}shellOpenHomePage” /v legacydisable /f

That should fix that!