Hello Tanya,
Is this computer a name brand machine such as Dell, Gateway etc? If so you should have the recovery CD which came with the computer that will reload the operating system that came with it, in your case Windows XP Home. You will need to use this recovery cd to reinstall the operating system so you will be using a genuine copy of Windows. If you are having issues with drivers either missing or not functioning I would recommend you contact the vendor of the machine such as Dell for technical support regarding this issue. If you have any further questions or concerns please post back here.
Thank you,
Matt Prall, MS
WGA Forum Manager