Hi Renato,
If you have a retail copy of MS Office XP Professional Edition then you should be able to install and activate on a new PC. If it's
an OEM edition (packaged with a PC) then the license is to that first computer rather than to you and travels with that computer.
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I am selling my old PC and will sell it with hard drives formatted. I want
to install the office XP Professional on my new PC. Will this be a problem? >>
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
For Everyday MS Office tips to "use right away" -
http://microsoft.com/events/series/administrativetipsandtricks.mspx