I think winblow$ will not show what is happening

go,boot a knoppix/ubuntu livecd,run SMART Test(u can run it from manufacturer's bootable cd,but I read in this forum that they will show no proper results ),I am sure this is not a hdd problem,it is viruses which is playing with imeow&his vista
edit:and not to say that SATA connectors are responsible for restarts and hangs 50% of the times.get a asus sata connector from some PC service guy or a shop!they are reliable and fits correctly