Can I only load this on 1 machine?

[Faustblade]

Hey there folks, quick question.

I'm curious if anyone else has been able to load this on more than 1 machine. I play from my desktop at home, and on my laptop at work.
The problem I'm running into is that when I load this up on my laptop and log into the R* social club, it hangs at the verifying activation and then pops up a message saying that my activation is corrupt and to re-install the game and to re-activate my key.

I re-installed the game, but was not able to enter anything else to activate my key. So, any suggestions?

Thanks in advance.