How to install the AMD X2 drivers, hotfix, the correct way. - XtremeSystems Forums. OK, I don't know if this is valid, but the recommendation on this site is to apply two hotfixes to improve Athlon X2 stability and to make it work with ACPI...
# Install the amd athlon 64 x2 dual core processor drivers from "AMD":http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,00.html
# read this website and download the hotfix....READ "Microsoft":http://support.microsoft.com/?id=896256 documentation and download from "Sendfile":http://www.sendmefile.com/00213285
# Edit your registry to enable the HOTFIX, follow these steps.
## Click Start, click Run, type regedit in the Open box, and then click OK.
## Right-click HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager, point to New, and then click Key.
## Type Throttle for the new key name.
## Right-click Throttle, point to New, and then click DWORD Value.
## Type PerfEnablePackageIdle for the value name.
## Right-click PerfEnablePackageIdle, and then click Modify.
## In the Edit DWORD Value box, type 1. In the Value data box, make sure that Hexadecimal is selected, and then click OK.
## Quit Registry Editor.
# Make sure your BOOT.ini has this command in it, /usepmtimer to check, right click on My Computer go to properties, click on the ADVANCE tab, then under startup and recovery click on settings, then click on EDIT....make sure your boot.ini looks like this
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /usepmtimer