read through this
http://superuser.com/questions/10502/why-does-my-windows-7-pc-freeze-after-waking-from-sleep
Type: Posts; User: RickyTick
read through this
http://superuser.com/questions/10502/why-does-my-windows-7-pc-freeze-after-waking-from-sleep
Try a system restore to a date prior to when the error started occurring.