Unlock all APU cores A4 5300

[ImterriblewithPCs]

I really would like to find out how to enable all 2 of my APU's cores as in the bios and on the AMD website it says it is a dual core 3.7GHZ AMD A4 5300 Trinity APU, this is also displayed in my BIOS screen on the ASUS A68 HM-Plus mobo using bios 1401. However in windows 8.1 the system specs list 1 processor with only 1 core, and before anyone says it... task manager only shows 1 logical processor core. I've tried using parkontrol to unpark the 2nd core and tried using msconfig to enable both cores yet only one is shown. All help is appreciated.
I felt it was worth noting that I upgraded my cpu,mobo and PSU most importantly the previous CPU was a celeron dual core intel product but using the exact same HDD with the same windows installation I moved it to my upgraded A4 5300 APU PC. Could this be the culprit?

 

[InvalidError]

Reusing the same Windows install when switching between AMD and Intel platforms may have numerous odd side-effects. Having the wrong APIC and other multi-processor-related drivers installed could very well explain why Windows is unable to initialize more than one CPU.

 

[ImterriblewithPCs]

Reusing the same Windows install when switching between AMD and Intel platforms may have numerous odd side-effects. Having the wrong APIC and other multi-processor-related drivers installed could very well explain why Windows is unable to initialize more than one CPU.

Thank you for the quick reply... also I think my HDD is dying so I may replace it soon with a new HDD along with a fresh windows installation. Anyway I will select this as the answer. Thank you for your support