What are your system specs? Have you monitored temps for your CPU/GPU when gaming? Checked the system event log to see if there are any errors? Is it any game or just one game?
temps are ok, it's any game that this happens.
AMD Athlon(tm) 64 X2 Dual Core Processor 5000+
1.00 GB (RAM)
VIA Chrome9 HC IGP Family WDDM
260 MB Total available graphics memory
199 GB Free (233 GB Total )