This has a lot of options - too many to copy into the body but the accepted answer was:
AVG has been known to cause or aggravate these issues so I would
uninstall it and run the AVG Removal Tool to prevent trouble causing
remnants from being left behind. Below are recommendations to use
while testing, even better permanently.
AVG Removal Tool - run this http://www.avg.com/us-en/utilities
List of anti-malware program cleanup/uninstall tools
http://social.answers.microsoft.com/Forums/en-US/msestart/thread/407bf6da-c05d-4546-8788-0aa4c25a1f91/
Here is what I use and recommend : (These are all Free versions and
very effective.)
Avast and Prevx have proven extremely reliable and compatible with
everything I have thrown at them. Microsoft Security Essentials and
Prevx have also proven to be very reliable and compatible. Use MSE and
Prevx or Avast and Prevx however not all 3.
Avast Home Free - stop any shields you do not need except leave
Standard, Web, and Network running.
Prevx - Home - Free
Windows Firewall
Windows Defender (not needed if using MSE)
IE - Protected Mode
IE 8 - SmartScreen Filter ON (IE 7 Phishing Filter)
I also have IE to always start with InPrivate Filter active if IE 8.
(You occasionally have to turn it temporarily off with the little Icon
on LEFT of the + bottom right of IE)
Two versions of Avast are available 6.x and 4.8x
Avast 6.x - Home - Free - Stop the Shields you do not use (except
File, Web, Network, & Behavior) - double click the Orange Icon in
Notification Area - Real Time Shields - click the Shield you want to
stop - STOP. To stop the Orange Icon from showing an error indicator -
click the Orange Icon - Upper Right - Settings - click Status Bar -
uncheck the Shields you disabled - click OK
http://www.avast.com/free-antivirus-download
Avast 4.8x - Home - Free - stop any shields you do not need except
leave Standard, Web, and Network running. (Double Click Blue icon -
details next to OK. - upper left Shields - Terminate those you do not
use.) http://www.avast.com/free-antivirus-download#tab4
Or use Microsoft Security Essentials - Free
http://www.microsoft.com/Security_Essentials/
Prevx works well along side Avast or MSE
Prevx - Home - Free small, fast, exceptional CLOUD protection, works
with other security programs. This is a scanner only, VERY EFFECTIVE,
if it finds something come back here or use Google to see how to
remove. http://www.prevx.com/ <-- information
http://info.prevx.com/downloadcsi.asp <-- download
PCmag - Prevx - Editor'a Choice
http://www.pcmag.com/article2/0,2817,2346862,00.asp
Also get Malwarebytes - free - use as scanner only. If you ever
suspect malware, and that would be unsual with Avast and Prevx running
except for an occasional low level cookie (no big deal), UPDATE it and
then run it as a scanner. I have many scanners and they never find
anything of note since I started using this setup.
http://www.malwarebytes.org/products/malwarebytes_free
you can check in system logs for disk errors; if there's any. I saw this error also for sata controller related problems or memory corruption. solved resetting CMOS (or changing the motherboard) – AndreaCi – 2012-10-12T14:00:14.090
@Sheep: What model SSD do you have and have you checked if there is a firmware upgrade available for it? Can you check the BIOS at startup to see what mode the SATA controller is set to use? Information about the motherboard and other components would also be useful. – James P – 2012-10-12T14:02:54.383
@James: I added the information you asked. – PlutoTX – 2012-10-12T14:35:15.357
@Sheep: Have you tried Safe Mode? If the problem still occurs then I suspect there is a hardware problem. – James P – 2012-10-12T15:47:58.050