Thanks for the replies guys.
RadiclDreamer: Yes I think that also, it might have to do with duel channel because the sticks are the same size but they are not matched. However, I don't see how you can turn off duel channel by hand in the BIOS seems like they dumbed it down a lot and the only setting under memory is check memory. As another T60 owner do you know how to get into the more low level settings for memory like timings and the like.
ch33zw1z:
I have seen that, but I don't have that network card. It only happened once I added the second module to my computer but the number of errors has increased from one every other week to one every other day since I added the second module.
There also were many software driver changes in that time period and the first crash, might not have been a memory parity error as all I have to go on is the windows logs, and it could have crashed for other reasons, but no blue screens in 6 months then in the same month I added memory that is pretty damning to the memory.
Some people think that ATi hypermemory implementation is to blame over at the thinkpads forum. But it is hard to say, and if that is the issue then why with the second stick, hence why I also suspect the duel channel.
Bruceb:
They are matched except for manufacturer. DDR 667 CL 5 1 Gb.
The IBM BIOS does not appear to let you modify low level settings.
Again I don't have the network card, I don't think I have a source for borrowing.
EDIT: Oh yes I have the second latest BIOS. In the interest of reproducibility I'm not changing that parameter, the change log does not indicate the changes would improve the problem.