If you choose to keep blocking it....IE probably will pop up saying its just trying to phone home to MS. Just trying to send your windows media player song,movies,file list to "help" MS understand what its consumers are up to. Nothing to worry about, please let MS access your harddrive to erase those nasty .mp3's

hah, now wouldnt that be interesting...MS building its firewall and accidentally stops itself from messing with your system