Yes, very good move on your part. I dunno how I missed it, but that hamachi.sys was the only suspect driver left. I would have definitely told you to remove it if I didn't miss it, as it crashes Windows 7 all the time. It can't run well on Windows 7 at all.
Good luck but I think you probably fixed it.
If not, there is a definitely memory defect OR improper bios setting in relation to RAM.