You are using a NForce Motherboard as well?
I used to have the same issue on my Aspire 4530 also nForce board but 9100M G instead of your 8200M G.
Instead of using dated Acer Drivers I used NForce Driver from Nvidia.
Error never appeared again.
If it was a hardware error it should have issues such as hangs and unintended reboots.
Because of that I am 100% sure it is a driver error.
Note there are 2 drivers in the motherboard driver installer package that causes this.
Nvidia PCI Bus Management and Nvidia SMBus Management both are critical to having no errors.
Sometimes driver package installers left out 1 of the 2 drivers.
Acer Aspire 4530
AMD Turion X2 2.1GHZ RM-72 1MB L2 Cache
4GB DDR2 667MHZ
NVIDIA 9100M G
320GB WD BEKThttp://aspiregemstone.blogspot.com/