Good suggesstion...
I've tried to install a demo on Steam: At 50% of downloading Windows said "Steam has encountered a problem and needs to be closed" - I tried to restart it and Windows said "steam.exe not found". Computer says: No SSD in there >;C
Damn it... but might be the best way.
EDiT: It occured now on two different SSDs... it's just too weird that two SSDs fell out.