I tried with and without launching Kaspersky AV 2009 with no success. I scanned for malwares and virus, did a lot of the tips I found on various forums nothing works !
It seems that something is preventing the register keys to be permanently changed.
When I boot in safe mode, the System restore settings seem to be saved, so the problem appears in Normal mode only.
Any ideas ? System Restore did'nt help me much in the past, but this problem could hide another one, don't like that.
Thanks for any help