Strangely enough, the PC doesn't freeze up when in Safe Mode with Networking where I can browse the internet OK. When the PC does freeze I can't see any particular proccess hogging the CPU (whose activity isn't high anyway).
The reason I suspected a virus was that for some reason all my system recovery points had gone. I know certain viruses can do this.
I've installed 3 different AV products done full scans and they've found nothing.
I've installed 3 different anti rootkit products and they too have found nothing.
So I'm not sure it's a virus/malware.
Attached are DDS and HijackThis logs.
All help much appreciated.