Hi ren
,
It depends...
Is the suspected file 'win32k.sys' always the same to popup 1st in these BSoDs?
If the file name to popup 1st in the BSoDs is more than this one then it could be anything from a bad memory module to a nasty virus.
Taking for grated that your PC is in good secure hands in terms of virus/worms I'd start by checking
the memory modules with maybe
http://www.memtest86.com.
Or the CPU/BUS speed configured through the Mainboard jumpers or in the BIOS.
You need to be sure that the whole system is not overclocked or something.
Maybe Jorel can help more than this.
Cheers