Is this possible to do please be kind and replay?

Hi dudes i have one question for good people with a lot exp on net with IP and virtual machines.
Anyway here is the thing:
I work on one site and it is not allowed to have 2 or more acc, but some people works with out any problems with more, and make money, but that is not by the rules and i am afraid of ban.
Now i had one idea, and i need your opinion guys so please help me out.
It is allowed to work 2 or more people from the same house but with different PC, i have only one and i can register my sis for example as second member in house.
And still have problem with one PC - SAME IP - so is it possible to install virtual machine who would generate other IP and work on both acc in the same time ?
By the virtual machine i mean on wmvare work station for example, it is another machine so IP should be different, correct me if i am wrong or is this possible. Where i could see some tuts i had never worked with that only hear that some people do.
Thanks in advance people.

I don't think that the ip it will change

With proxy it could but that is also not legal on site so i still search for better solution

. bump

Get a private proxy or VPN..

buy some dedicated proxies, 5 of them should cost less then 15 dollars.

EDIT: Nvm, someone mentioned already.

Use a VPN for this. As it completely covers any traces of your original IP

Even a cheap VPN like hidemyass will do the trick