Returning from v5.windowsupdate.microsoft.com to v4.windowsupdate.microsoft.com

Although there was a statement not to continue if SP2 wasn't installed, i did continue to install the new software on v5.windowsupdate.microsoft.com, just to see how it looked...
But after that I was unable to revert to the current update site (v4.windowsupdate.microsoft.com). By searching Google I learned I was not the only one with this problem ;-)
No post could help, so I started combining solutions. Finally it got it to work.
Here are the things I did (some of then might be unnecessary, but hey, it works!):

- Find the file wuweb.dll and delete it (make sure hidden and system files and folders are visible)
- Go to Start > Run and type "regsvr32 iuctl.dll /u" (without the quotes) to unregister this DLL.
- Use the Windows Search (or any other) to find the files iuengine.dll and iuctl.dll. Delete all occurences of these files (make sure you delete the ones in %SystemRoot%\System32 last).
- Go to %Program Files%\WindowsUpdate
- Open the v4 folder and delete everything in it except for the iuhist.xml file
- Reboot your computer

v4.windowsupdate.microsoft.com should be working again.
If not, good luck ;-)