i got same prollem.. ive had it for some time now and for me this is with most full screen applications like games (halo, gunbound, disciples) and even full screen on slide show doesent work... i dont believe this is a problem with PJ64, because this started happening about 2 months after i had PJ64 i have a P4 2.2 GHZ 512MB ram Nvidia Geforce4 ti 4400 newest drivers are installed and usin XP home... for gunbound though i hit ctrl alt del, and hit bring to front and that works, but not with halo... i have scanned for virus's and spyware numerous times, but still nothing... if u have problem with any full screen appliaction that dont start in windowed mode, open up command prompt start--all programs--accessories then type in the directory (cd (directory)) if ur not sure the directory, its just like going through my computer.... and then u add -window at the end... so if i were to open up halo i have to open command prompt and type cd C:\program files\microsoft games\halo (enter then i type) halo.exe -window and it runs it in windowed mode... in some old games this doesent work (disciples, starcraft) or any game that has a startup program before it runs the right programs.. in that case as soon as u start your computer try going on it... for me it seems that whenever i have the problem is when im online... but i have yet to find a solution...