There is a virtual device seems to have driver issues according to the last system information report.
A little research shows this driver is related to "Video" and can cause freeze issues.
Security Processor Loader Driver ROOT\LEGACY_SPLDR\0000 This device is not present, is not working properly, or does not have all its drivers installed.
Security Processor loader Driver - Windows 7 Help Forums
Please try the below steps.
1. Uninstall the device from "Device Manager".
2. Remove currently installed display driver in the proper way.
How-To Uninstall AMD Catalyst Drivers From A Windows Based System
3. Update the display driver to the latest.
If that also can't fix the issue, i would recommend getting the RAM replaced from the store.