I'd suggest checking your Event Viewer to see if there are any errors there. Go to Start...Run...and type in "eventvwr.msc" (without the quotes) and look in the Application and System logs for errors around the time that the DOS screen flashes.
Otherwise, I'd have to suggest using a tool such as the free Process Monitor to find out what's causing the DOS screen. Process Monitor is available here: http://technet.microsoft.com/en-us/sysinte...wt.svl=featured
Be advised that the log it generates is huge, so it's important to find the exact time that the DOS window flashes by. Once you've captured that time slice you can post the data here for us to have a look at.
Is there a reason that you've got both the ATI and the nVidia drivers installed on your system? Do you have 2 video cards (such as an onboard video card and one that plugs into the motherboard) - or do you have a TV card along with your video card?
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