At present I am running windows 98 2nd edition but as it is too old now I wanted to upgrade it to Windows XP home edition. Hence I also upgraded little hardware in my system like HDD, RAM, etc. Now the problem is I bought a Windows XP from EBay without product key assuming mine Windows 98 product key will work with the same. But when I installed Windows XP, I found that it is asking me for the product key. Note the windows Xp bought was not the upgrade. Now can you guys please suggest me something? What should i do now?