Can it be used in a processor....NO.
Can it be used in a PC.....YES.
You have to put it in as a slave. The original HD should be set up as a master allready but you may want to check that.
In WindowsXp right click over My Computer. Select Manage. Go to disc management.
YTou should see your new hard drive there. You can now format and partition it and it will be ready to use.
Danny