How complicated is it to shift program files from one drive to another? Specifically, I want to move Steam's game files (over a gig each) from C;/Program Files/whatever to my new big drive E:/something to free up space on the C:/ drive for the rest of the family (6.5GB worth on a 20GB drive), plus I want to get Day of Defeat:Source and it won't fit on C:/. How exactly do I transfer the Steam/Valve folder without confusing the program and/or Windows?