My initial thought is a bad HDD. If it were an older IDE drive, I'd also be thinking it's a DMA issue, but that shouldn't affect SATA drives.
It sounds to me though, like your HDD is bad. Every 15 minutes or so is a pretty plausible time for when Windows might do a delayed memory dump, writing things to disk that it's been holding in memory. And that can in turn trigger your AV program, compounding the issue.
Download the Ultimate Boot CD distribution, and run some of the HDD diagnostic programs. There's one or two that will run a full surface scan and also report any SMART issues the drive's internal diagnostics are reporting. Worst case scenario, it's not your HDD, and you wasted some time. But, you did rule out one more component, so it's not a total loss either way.
Thanks for reading my post.
My problem is an intermittent computer freeze which occurs every 15 minutes or so and stays frozen about 5minutes... Typically the mouse will not be frozen during this time. Some tasks cued up may occur while frozen. Pressing Ctl Alt Delete may, sometimes instantly, sometimes several seconds later, pull up the main menu, however regardless of anything I do in task manager, it will unfreeze arbitrarily. It seems to happen more frequently when I have multiple windows open, and more cpu/video-intensive programs.
Pressing CTL ALT DELETE in many instances causes the display to go black for some time, and I have from one program, received an error message claiming that the video drivers were being used exclusively by another program, so I have a suspicion that the video card may have an issue to be troubleshot.
The system worked without a hitch when it was first built, however since I first reinstalled windows 7 I have been experiencing this issue.
My initial thoughts are that there is a problem occuring with the installation of windows 7, although I have reinstalled it several times and the freezing issue remains. Oddly enoguh, on one random occasion, windows 7 claimed to not be authentic. Another thought is that the video card may have issues. Finally, perhaps a setting in my bios or another system setting needs to be changed? I don't believe there is an issue of overheating, as the cpu usage appears to be pretty low, but I can't rule that out either. I believe I've ruled out malware/virus by reformatting the hard drive and reinstalling windows.
Here's my Hardware/OS
Integrated Raedon HD 4200 w/ amd quad core (Gigabyte)(latest video card drivers are installed)
Windows 7 pro 64 bit OEM
4gig 1600 ddr3 (already ran diagnostic to verify that it is working fine/memory claims to be compatible with the motherboard)
Western Digital 1 Tera Hdrive
Thanks in advance for your insight,