Ok, I tried to remove the string and it didn't work. I did get it to work the way I wanted it to work by modifying the line from
strUser = Mid(strNTUser,(instr(1,strNTUser,"/")+1),len(strNTUser))
to
strUser = Mid(strNTUser,(instr(1,strNTUser,"\")+1),len(strNTUser))
This left the line alone without causing any major problems. I know this isn't the best/cleanest way to get this to work, but it seems to be doing what I expect it to do. I'll update this post if it blows up. Thanks for the help.