I sorted it by deleting or returning to default the registry keys found here.
http://wiki.litestep.com/LiteStep:Installation.

When changing evrything back i noticed i had 2 DWORDs with the name DesktopProcess and a value of 1 in
"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer"
but none in "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced"

Would this have caused a problem?

Chris