Download the latest manual at http://www.ecsusa com/downloads/manual/k7s5a10eng.zip The original manual has typos and the settings may be wrong for your processor. Also make sure you are cooling your new processor right as it runs a lot hotter than your old Duron. Check the voltage on your ram and processor and make sure they are getting the right voltage. [log in to unmask] [log in to unmask] [log in to unmask] [log in to unmask] -------Original Message------- In a computer using WinXP I just changed from a AMD Duron 750 processor to a Athlon XP 1700 processor. The 1700 processor is fairly new (about 3 months) and has been working great in another computer. Since I installed the Athlon XP 1700 in place of the 950 Duron, the computer freezes and keeps locking up. I have never had to reinstall Windows before just because I changed processors, motherboards yes, but a processor? Because I changed from a Duron to a totally different (except for the socket it uses) processor, the Athlon XP, will I have to now either reinstall WinXP or run the repair?? Or should I be looking elsewhere for my problems?? The motherboard is a ECS K7S5A with 394 of memory. No service pack installed (this is a corp. edition that won't allow the service pack to be installed, anybody know any work-around?) Scott Stone PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml