Ahh just double checked, seems that I have the 8371, instead of the 8371G, vendor wrote it wrong on the invoice.
Thanks for your help.
Would you also happen to know how to access the recovery partition on this model?
The forced shutdown may have caused bad sectors on your PC's HDD, hence the slow performance.
It usually takes many forced shutdowns to cause bad sectors but maybe this particular one caused a huge cluster of sectors to die.
OK, sorry to be fussy but next time, please use short paragraphs.
I previously used a D600 as well and it came with an internal bluetooth module chip, I had absolutely no issues when installing the drivers fresh from a format.
Try formatting and reinstalling.