Dear Rich,
Thanks for the quick reply.
The restore was through F10, so it looks like a hard drive or memory problem (thanks for the reference to the error codes).
The reason for the restore was that I was getting frequent memory 'dumps' and problems on start-up. Does that point to memory rather than hard drive?
I also ran the hardware diagnostic on the C and E drive and this seams to be OK.
The model is a VGN CR42 (MEC 34 304 SEDE).
I'm afraid I am not a computer expert, so I haven't ventured into the area of fitting memory modules - is this a challenging expert job, or can a beginner like me cope?
Many thanks for your help.
John