This computer was given to me this way and I want to pass on to someone who needs it ready to go. The windows sticker is still on the machine so I have the product key but there was no software with it to reinstall. I did some research and found out that it is not available for purchase but I do have the option of borrowing a copy and using my own product key to do the install. I needs to be an HP OEM. It does not state on the windows sticker if it is 32 or 64 bit so I guess I may need to try both. Anyone have any suggestions.