It's been a long time but I finally managed to install a new hard drive (and SSD) and install Windows 8.1 alongside my other hard drive with Windows XP. I had to use Easy Boot BCD to help sort out the dual boot and now it starts lovely.

However I have noticed that the CPU fan has been working super hard lately and at first I thought the sounds were hard disk related but after opening it up I can feel intense heat in the enclosure (measured around 47.9 degrees centigrade on the fan surface with a laser thermometer) and my cpu usage is pretty high a lot of the time.

This has only happened now I have a dual boot. Can anyone help as to why this is happening and what I can do? Should I be worried? When the CPU usage hits 100% windows XP freezes and otherwise is a bit laggy sometimes.

Intel Pentium Dual Core E5200 2.5GHz Socket 775 800FSB 2MB Cache Retail Boxed Processor

Gigabyte GA-73PVM-S2H GeForce 7100 Socket 775 onboard VGA 8 channel audio mATX Motherboard

Corsair 4GB Kit (2x2GB) DDR2 800MHz/PC2-6400 XMS2 Memory Kit CL5 1.9V

Arctic Cooling AC-FRZ-7P Freezer 7 Pro Socket 775 Processor Cooler
Qty: 1Cost: 14.21

OCZ Stealth Xtream 500W PSU - 1x PCI-E 6/8pin, 2x SATA 12cm Fan
Qty: 1Cost: 40.90

Coolermaster Elite 330 Black Mid Tower Case - No PSU

Samsung SpinPoint F1 HD103UJ 1TB Hard Drive SATAII *32MB Cache* - OEM (Windows XP installed)

Hitachi 120GB Hard drive SATA (Windows 8.1 Professional Installed)

OCZ AGT3-25SAT3-240G Agility 3 240GB SATA III 2.5 inch SSD