WMD ran, possible ram problem?

Hello all,

I have a couple questions, so please bare with me =D I suspected a RAM issue so i ran the windows memory diagnostic tool and came up with the following errors
INVC 4 errors
LRAND 1 error
WMATS+ 4 errors
WINVC 5 errors

this was after letting it run all night whilst i slept. The WMD said it could not locate the module that the errors were coming from. i read that the wmd tool tests various memory modules, not just the ram so my question is is this most likely coming from bad ram?

I have an asus k8v deluxe SE mb with two sticks of 512mb corsair ram,pc3200 400mhz. my next question is that if it is bad ram can my mb support faster ram speeds? i tried searching but i couldn't find exactly what i was looking for. it seemed like from what i gatherd i can only support up to pc3200 ddr2 at 400mhz. it also seemed like some of the info was eluding to it being faster to run only 2 sticks on the board, so two 1 gig sticks of ram, one on the blue and one on the yellow. is this right? Thanks for any help guys.

-Kris