unexpected crash

Hello Experts,
Some of our stations have started to crash.
All of a sudden they freezae and we need to restart them.
When restarting they say windows recovery and last almost 30 min to recover automatically.
 
Our apps are stable everywhere and there is little installed in each computer.

Cant explain why this is happening.

Is there any tool or procedure you can suggest me to check the integrity and how stable that station is ?
Those particular stations were using win 7
Regards,