First BSOD - ubuntu on restart

[NicoleUK]

Samsung NP-RF511-S02UK
Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1


My laptop blue screened/crashed for the first time since I bought it about 8 months ago. When I switched it back on it started up with 'ubuntu' I had no idea what this was so held the power button and restarted it again and selected windows.
I don't know how this ubuntu got onto my laptop I've haven't seen or installed it before? I thought it may be some sort of virus till I googled it.

Any idea what's going on?

I've attached the dump files.

 

[writhziden]

Crash/Ubuntu Behavior:

Nothing in the reports to indicate the crash. Due to Ubuntu loading without you installing it, I still suspect a malicious attack on the system.

• Download and install Malwarebytes, update it, do not start the free trial, and then run a full scan. Also run a full scan with your antivirus software installed on your system. If you do not have antivirus software installed, see the http://www.sevenforums.com/system-s...-system-security-combination.html#post1732627 for better security steps and scanning tools. Make sure to update the security software before running the full scan.

Fix Your Boot Sequence:

I also strongly recommend http://www.sevenforums.com/tutorials/219533-troubleshooting-windows-7-failure-boot.html to fix the boot sequence.​