I'm on a PC (win.7). What's the procedure to uninstall Dawnguard without uninstalling the game. Can I load a save (before Dawnguard was installed) and start from the save point.

There are two "Dawnguard" files in my Skyrim folder.

Data / Dawnguard.bsm and Dawnguard.esa

Can I just delete them?