BOSD win7 and MBR lost on ssd 120gb extrem

(excuse my bad english)

I have a probleme with my ssd extrem 120GB, sometime my win7 crash with BOSD, at the restart he didn’t boot, he write an error like this 0x0000004c (not sure) and “please insert…win7… choose repair”.

I boot with win7 cd and repair the boot and all it’s ok, but it’s the 5 time i do this and i don’t understand, i don’t do the same things when pc crash, my firmware is update (r201) all my drivers are update, virus, mailware,spyware check.

before i switch to the ssd (my installation is fresh on ssd)  i have no problem, i don’t understand.

i need your help.