Just to say that I finally found why I had scope freeze, after weeks to be annoyed with that problem...
Each freeze seemed to be link to the system, but I didn't understood which parameter I should change.
I've seen an option in the p7p55d bios called "memory remap feature", which must be enable only with 64 bits system.
Since I run With xp 32 bits, I disabled it, and now it runs perfect.
Maybe it could be useful for some people
