hi everyone. sorry for my probable bad english :)
ok so the problem started since I changed my laptop CMOS battery. and to be honnest there wasn't any problem whit the clock when I replaced it but I though it might be the cause of another problem wich later I figuered out that the problem was because of the RAMs.
anyway I changed the RAMs and that problem was solved. I just set the BIOS clock and restarted the system. after a while I figuered that the windows clock is not right. I restarted again and saw the BIOS clock. it was reseted to 2009! even when the laptop battery and the AC power are connected both the BIOS and windows clock keeps changing! I even changed my windows and replaced the CMOS battery with the old one but nothing helped. It seems realy odd but I don't think its a hardware problem maybe there is a driver or something for CMOS battery... need your help! thanks !