Speccy snapshot: http://speccy.piriform.com/results/ybAknYpXHO0IGnyIeQM1PSJ
My hard drive passed SeaTools' S.M.A.R.T. Check, Disk Self Test, Short Generic, and Long Generic tests.
This computer has never been the most stable, but new strange symptoms have popped up recently. When using Virtualbox, some guest operating systems under certain conditions bring the entire host down. Most of the time it's contained as a (very annoying) blue screen inside the guest, but sometimes it causes the host to freeze (numlock stops toggling keyboard light, level of freezing), or sometimes BSOD.
Historically, I've had BSOD issues with certain games under certain conditions. I never managed to get that under control. Recently though, VMs started being affected too.
What I find very odd is that my linux VMs are unaffected. My Windows 7 VMs are the main victim of this.
The computer remains stable under day to day use, though. Web browsing, memory intensive programming, image editing, and every benchmark you can throw at it. All fine. Which is very confusing.
Not sure where to go from here. Any help is appreciated.