I agree with Brink here. If your laptop came with Widows 7 already installed, you have an OEM version that is tied to that computer. Retail versions are licensed to be used on one computer only, meaning you can only have it one computer at a time. As Zepher said, if you are using a retail version and want to put it on a different computer, you will need to call Microsoft to activate, but you shouldn't have problems with the move.
Cheers,
Cassandra
Microsoft Windows Outreach