Hi, I have a Dell PC with XP Pro Pre-installed. Over years, I have changed the Harddisk, RAM, DVD Drive, BIOS, CMOS Battery, etc. After every reformat, I call up Microsoft and ask them to activate my PC which they have been kind enough to oblige, so far. Since I have long crossed the automatic activation method counts. Recently, I learnt about nLite and UA Installation and I created a great UA CD for my PC. However, I am not able to make it activate automatically. I tried both the methods - Backup Activation Method & OEMBIOS Method, provided in Guide To UnAttended Windows Installation Can somebody please guide me how to get this going or tell me where I going wrong? After the most recent activation (3 Days Ago) through telephone, I have copied and kept separately WPA.DBL & WPA.bak and OEMBIOS.BIN, OEMBIOS.CAT, OEMBIOS.DAT & OEMBIOS.SIG. Thank for your help in Advance! Mahesh Kumar