Doing a windows shutdown, form the start menu, should not put you into hybernation. Not all spyware programs are flawless. I had this same problem a few months pack after my Daughter had download a file from Kaaza (horrible program!!!). My MacAfee antispyware and others did not find the program that was running in the background. I finally found it my using a program called Xcleaner.....Bargain Buddy!!! So I now use 4 spyware programs. My original assessment remains. If your puter was just black screening at idle that would be one thing. But the act of shut down from the start menu....the puter should shut down!!!
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.