@TE5LA
You need to install Service pack 1 & 2 ;-)
@sa_ddam213
Have You tried using The "alternate shell" option in vista Group policy to use mediaportal as a shell insead of explorer.
HTPC boots to welcome screen then mediaportal starts (no desktop ,no explorer) works flawlessly for me.
! it's work also for me I think that some of my friends will be also happy...
ps for others users : in the readme .txt read "Type gpedit.msc"