My friend, uh bob, installed Visual Studio 2013 with a "VERY-LEGITIMATE" serial he got off the internet. He later decided that he should probably get a "EVEN-MORE-VERY-LEGITIMATE" serial for cheap off some nice guy called Sean off some red-it forum thing but he is unsure how to TOTALLY OBLITERATE THE ORIGINAL SERIAL SO AS TO REGISTER VISUAL STUDIO.
Bob is SOOOO DUMB. HELP!