My boss asked me to install Windows 7 for him. Without thinking about drivers at the time, I just said "just give me your HDD, and I'll do it." I put his drive in my computer, installed it and some programs, put back his data and gave him back is drive.
Sorry to have to say it but this should be included in "How Not To Install Windows" article. I know ya don't wanna do the work, but a fresh install is the way to go. Also, remember that you did activate it on your hardware so it's is your hardware not your boss's which will always be identified as belonging to that particular copy of windows. If it was a retail copy, no biggie....if it was an OEM copy ... at some point, soe one gonna have some explaining to do and I think that would be better sooner than later.