AMD Phemon II 555 on Windows XPx32 runs only 1 core

C

createdesignstudio

Hey guys,

As in title, the computer only seems to run on one core. Bios is updated to latest version. Here's the computer:

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Operating System
Windows XP Professional 32-bit SP3

CPU
AMD Phenom II X2 555 33 °C
Callisto 45nm Technology

RAM
4.00GB Single-Channel DDR3 @ 669MHz (9-9-9-24)

Motherboard
Gigabyte Technology Co., Ltd. GA-78LMT-S2P (Version 3.1) 36 °C

Graphics
VA1912wSERIES (1440x900@60Hz)
ATI AMD 760G (Gigabyte)

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I tried playing with settings in Bios, including unlocking the CPU so you could see the four cores in the Bios. The PC then recognised the processor as Phenom II x4 555 (both Speccy & CPU-Z confirm this), but still only sees and uses one core.

Any thoughts?
 
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