trying to troubleshoot my notebook Acer 5600, I ran Memtest86 with the two 512Mo RAM, with one and the other one, but I have the same error each time : 
The Windows XP installed crash on connection screen, but I reinstall a corporate Windows XP and run it severals hours without any problem. Linux installation still run fine.
Actually, is there any problem with my notebook? With RAM or CPU? How can I really check it?