I have found now that all the dooms are available for digital download on gamestop, and i would like to know if they are windows7 compatible. I'm assuming so because they are published by bethesda, but i want to make sure.

They propably have DOSBox included to emulate a DOS running environment, so they should work fine. However even if not, you can run them trough a http://doom.wikia.com/wiki/Source_ports.

Personally i prefer http://zdoom.org/News that works perfectly with Win 7 64bit, but as the first link shows, there's a whole lot of them.