AMD DUAL CORE CPU

If you have a dual core PC, and you installed it yourself or you are having troubles with it running some applications, chances are you haven't done the often overlooked steps to properly install dual core into your XP operating system.

Install the Windows XP SP2 Dual-Core Hotfix
Download the hotfix from:
amdzone.com
The hotfix name is: WinXPdualcorehotfix.exe
After installing, restart.

Go to Start, Run. Type regedit and push OK. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager. Right-click Session Manager and do New, Key. Type Throttle for the name. Right-click New, DWORD Value. Type PerfEnablePackageIdle for the name. Right-click PerfEnablePackageIdle and click Modify. In the Value data box, enter '1' (without quotes, default is most likely '0'); make sure Hexadecimal is selected and push OK. Close the registry editor.

Install the AMD X2 driver.
from amd.com
Under the technical resources of processors.

This is necessary and often overlooked.

If one specific program is having problem running on your dual core, it may be because it is souly designed for a single core CPU. To prevent errors with these programs, press CTRL ALT DEL and go to the processes tab. There you can right click that process and click "set affinity". There you can deselect the 2nd core and presto, you are ready to roll.