Hello, I've recently ugraded from Vista 64bit to windows 7 64bit. I used to have bluescreens several times a week and didn't really follow through trying to get them fixed. I thought upgrading to 7 would get rid of the bluescreens but after the install 3 days ago, I've bluescreened several times, 2 of them having to do with ntfs.sys and the latest one having to do with ndis.sys about 10 minutes after the latest ntfs.sys. I have 4 gigs of ram, an ep45-ds3l motherboard, E8400 @ 3.0 GHz and an ati Radeon HD4800 series (i believe the 4850). The last 2 times, maybe even all 3 times, I believe I had Firefox open, Windows Media Player running/playing on mute, Skype open, and Microsoft Security Essentials as my antivirus. The last 2 times I was watching a flash video. 3 dump files attached.