I need help.  I have Windows XP Home Edition installed on my Dell computer.  the only problem is that I have to reinstall it every 30 days.  The reason is because the disk for the OS is from a Gateway computer that I no longer have.  Hence I have no Prod. ID Numbers.  I have tried to get new ones from Microsoft but they tell me that it is not valid.  Being that I am retired and on a limited income I can not afford to purchase any new software.  How can I fix this?