Video issue

I have been having alot of problems with my computer and I have finally narrowed it down to a couple of errors. I have screen shot them and have the exact information if somebody can help. The main problem basically is that it seems that my screen keeps randomly freezing and slowing down in places that it shouldnt. It was not doing this before, but i was hoping there was a quick fix rather than having to go through and reconfigure my whole computer.

Error 1 Information Output:
WD-20110504-0009.dmp
sysdata.xml
WERInternalMetadata.xml

Error 2 Information Output:
WD-20110107-1255.dmp
sysdata.xml
WERInternalMetadata.xml

screenshot doesn't work, does your pc shutsdown eventually when the graphics freeze?

It never shuts down. When i play any type of video or try to get a game going. It lags like crazy and sometimes the video freezes up. but if i am typing i don't typically get a problem.