I have an HP Compaq nc 8430 laptop. The other day it just completely crashed and would not restart, so we had to do a complete and total restore back to factory settings. It was the only way the laptop would start. It wouldn't even start up in safe mode. It's been working fine since than and we ran all my scans including: avast, malwarebytes, spybot and super anti spyware and they have all come back clean. However this evening the laptop wants to finish installing updates, so I let it restart, but it refused to start up again. Luckily it only took a system restore to yesterday to get it to start again, but I'm not sure what's going on. Once again all scans come up clean. Any help or advice would be much appreciated.