Try F8 and the Last Known Good Configuration option.
If that doesn't work either, you will have to download an Antivirus Rescue Disk ISO, or repair-reinstall the System if the scan doesn't solve the problem. There is also the possibility it may have a hardware issue, or may be overheating, so check the message at the blue screen and make a note with the error numbers... pause the blue screen with the Pause/Break key if you have to. Also check the RAM modules are well seated in the sockets and check the cooler fan is working.