Blue Screen of Death HELP

My computer running Windows Xp SP2 plus all updates and secured by Norton is throwing up a BSOD every 30 minutes or so plus random shutdowns and reboots. The BSOD carries codes:-

BC Code 10000008E, BCP1 C00000, BCP2004DDB57, BCP3 B5 CPU 3.20GHz7B68C0, BCP4 00000000,
OS VERS 5_1_2600 , sp 2_0, PRODUCT 768_1

and

0x000000A , 0x8E22B2B0, 0x000000 , 0x00000000 , 0x804FD112

and

Message at bottom says 'Dumping physical memory to disk'.

Note I may have got the number of zeros wrong but the code letters are correct ( I think - and hope! )

The box has a Pentium 4 and 512 memory fitted.

Can anyone point me at a solution please.

.