DO NOT LET MICROSOFT UPDATE YOUR SYSTEM AS OF 05/25/06! Turn off your autoupdate feature until you have checked your OS ID. I own many copies of Microsoft XP Pro and after doing a reinstall a few months ago, Microsoft no longer recognized my software as valid. This did not bother me until doing a regular update as oftodays date stated above. If your OS is not matched to your MOTHERBOARD and OS ID, Todays update FROM MICROSOFT turns your OS into CRIPPLEWARE. You get nag screens and endless prompts to buy another version of XP. Microsoft help site doesn't allow you to tell them they are WRONG without PAYING A SERVICE CHARGE JUST TO SEND THEM A COMPLAINT.As many copies of their OS as I own and no longer use sitting in computers in my closet, I cannot stomach this. I will NOT pay them to tell them I am LEGITIMATE (I already paid...). Everyone needs to get serious with Microsoft on this. Interested as I am in LINUX, I don't want to switch when I am a LEGAL OWNER AND THEY WANT TO CHARGE ME TO TELL THEM SO. I have never hacked or stolen their software and I take great offense at them crippling my OS like this. Of course I have undone their screwup, but there may be millions of people who wont know how to do the same. Dont let Microsoft get away with this! Dont let Microsoft create a new wave of HACKERS with their outrageous HIJACKING OF YOUR SOFTWARE YOU PAID GOOD MONEY FOR (licensed only of course). I am legitimate and not afraid. I am ********@cs.com.