Unfortunately, Sharpreader doesn't seem to want to run as non-administrator right now. It looks like it wants to write to the Program Files directory. God, that's annoying, not to mention it usually makes the program completely single-user.
I'll play around with it and see if I can get it to work in a non-administrative context. Then I can let you know what I think. In the meantime, here's hoping the author fixes it in the next release.