Inconsistent errors while playing games

Is Windows fully updated? If not do that.

Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 50, {fffff9800064ce90, 0, fffff8000327176c, 0}

*** WARNING: Unable to verify timestamp for fbfmon.sys
*** ERROR: Module load completed but symbols could not be loaded for fbfmon.sys

Could not read faulting driver name
Probably caused by : fbfmon.sys ( fbfmon+330f )

Followup: MachineOwner
---------

Uninstall the Lenova boot optimiser. This sort of bloatware is often the cause of BSOD's. Also consider running through this to clean out other bloatware:
Clean Up Factory Bloatware

Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 50, {fffff8a0d28eb8d8, 1, fffff880014da900, 5}


Could not read faulting driver name
Probably caused by : fileinfo.sys ( fileinfo!FIStreamLogForNL+7b )

Followup: MachineOwner
---------

You need to test your RAM DIMM's/motherboard RAM slots for errors.

Run a minimum of 8 passes, preferably overnight, or until errors occur using MemTest86+.

Use this tutorial to help you use MemTest86+:
RAM - Test with Memtest86+

Ultimately, you may wish to perform a clean install to guarantee no bloatware on your system:

1. Download a Windows 7 ISO from here
2. Burn it to DVD or USB using Rufus
3. Install as normal.

Before installing, ensure you have the wireless adaptor driver from Lenova saved to another location to install. Windows Update will install 99% of the remaining drivers automatically. The rest you can tackle at a later stage.

Tutorial for reference:
Clean Install Windows 7

I uninstalled Boot Optimizer and ran MemTest86. It ran fine through four passes, I didn't have time to run it longer than that. I got another blue screen when exiting a game, the related minidump is attached. It also appears that when I play a game that will cause this sort of crash, it tends to break Chrome. All tabs will crash and not restart on refresh.

Windows Update also reports being fully updated