Please email the FE and ask him to remove the last 2 posts. This is an open Forum and its not a good idea to publish your email address.
You say you tried following the procedure on this Forum? What procedure? I haven't seen any procedure listed.
As to whether you can go back to XP it depends on A you having a new Windows XP disk you can use so it does not fail validation, which it will if you use a disk off another PC and B you need to check their are Windows XP drivers for your PC. If theres no Windows XP drivers for your PC I would forget it.