Thanks guys, much appreciated..
I had a look in the BIOS and in the dram settings, it was set to SPD but as my memory is DDR2 400mhz, the lowest manual setting is 533mhz so I presume that SPD is the best setting..
I've attached a snapshot of my system, does anything look out of place?
I think I'll try reinstalling the older BIOS to see if that has any effect.
I am trying hard not be influenced by WEI but as the drop was so marked, it's hard to ignore it..
I just ran Sandra and I've seen this before, despite having 4gb of memory, it's only reporting 3.25gb...? Is that because of sharing?
Thanks again.
Peter.