lowyhong: My PC seems to lock up at random. The screen doesn't go blank or BSOD. Whatever's displayed doesn't go away, but nothing works either. Alt tab, moving the mouse etc, all doesn't work. In the few occasions it's locked up, I noticed that it freezes while I'm:

a) watching Youtube
b) surfing eBay
c) playing Killing Floor and then pressing Shift + Tab to open the Steam overlay to chat with friends

I have the following software installed and running in the taskbar: Steam, ZyXEL network utility manager, MSI Afterburner, COMODO, Avast, Malwarebytes Antimalware.

I've checked my running processes and there's nothing odd. Virus and malware scans don't show up anything either.

I suspect this is a driver clash. Some time ago, my PC kept BSODing due to NDIS.sys, which means that it's probably something to do with my newly installed ZyXEL USB network adapter. I "fixed" it by uninstalling COMODO, then uninstalling the ZyXEL drivers and reinstalling everything. I haven't gotten a NDIS.sys BSOD since then, but now I get these random freezes.

I've also run a GPU and CPU scan using OCCT. No errors. Gonna try Memtest86 later to test for faulty RAM, but I doubt it's the RAM too. TBH I'm rather thankful it's (likely) not hardware issues, but I'll be damned, driver issues are a bitch to locate too. Any ideas?