In message "Colin
Barnhorst" wrote:

Run the memtest on each stick individually. It's all you can do at the
moment.

That, and try running memtest with both. If you can't do that, you have
hardware problems, Vista isn't involved or related at all.

Vista's memory diagnostic wouldn't hurt either, but I'd tend to prefer
memtest86+ here since it's based on a different OS, so it can rule out
whether Vista is part of the problem or not.