Hi: New to the board and am looking for a little help. Here's the problem: A couple of month's a ago I saved my pennies and built a fancy new computer. I also used Nlite for the first time to create an XPPRO unattended install disc mainly so I could to put My Documents and Settings on a seperate HDD from the OS/root. Seemed like a good idea at the time... Turns out I chose the wrong ACPI and I'm running an E6850 at half speed; only one core shows up on Windows Task Manager (yes I checked the one CPU per graph option under the view menu). On device manager I see two processors, at startup two processors, Asus P5k-E wifi/ap mobo; as far as I can tell no way to accidentally disable a core in the bios (though not 100% certain). CPU-Z tells me I've only one core. The final nail in the coffin is checking my hal.dll--original file name under properties is halacpi.dll; NOT halmacpi.dll which is what I guess it should've been. How I missed this for three months? I'm an id***. er, ah noob. So, two questions: 1) How can I easily fix this? (hopefully without too much more work; I've read a lot so far and gotten nowhere). I did try running HALu.exe (a hal updater someone wrote for just this task, but it did nothing...) I did not check repair as an option on my Nlite install. 2) If I reinstall my OS on the root drive via Nlite how do I retain or easily replace the data currently on my seperate data HDD? I do have backups. This is of course the last option as I don't feel like I can spend time making/testing a new nlite disk, installing, install all our app's again (Ugh!), migrating data...blah blah blah. Oh yeah this needs to be quick and painless as my GF with bombard me with grief if I spend too many nights up until 2pm with the 'puter. If this turns ugly she my do something drastic....like buy a mac.