Computer Freezing...

Hello all.
I wanted to first thank everyone who helped me with the BSOD. You guys rock. Although I haven't gotten the BSOD yet, my computer froze up on me. I left my computer running to download some stuff, but when I came back (several hours later), my computer seemed to be locked. What I mean is that my monitor was in sleep mode, but I tried to wiggle the mouse, there was no signal. My computer light (processing) was solid and I had to reset the computer. I check to see if there was a mini-dump, but nothing. I was wondering if I need to update the hot fix above (the sleep / hibernate)? In addition, does anyone know how to tell if my usb has a nvidia EHCI? I saw another hot fix, but wanted to make sure if I need to download that as well. Any insight will be appreciated. Thank you.

I also looked up my Event Viewer and notice an error message occuring. There are two and it said that lirsgt and atksgt failed to start up. Does this mean anything? Could these two things be the cause of my problems? Thanks.

Sorry for the multiple post. I guess BSOD strikes again. Enclosed are all my BSOD, however you probably only need to see the last one.