It's your choice to do what you want with my suggestions.
My suggestions are based on my experiences w/BSOD troubleshooting over the last 10 years or so.
Most BIOS update information that you find is from W7 and earlier - and that just doesn't apply to today's OS's (W8/8.1/10)
The current OS's communicate with the BIOS/UEFI more than W7 and earlier - and problems with those communications can cause other problems with your system.
Unfortunately, these sort of issues are more difficult to diagnose - as they tend to resemble hardware problems more often than not (which leads you on a wild goose chase while trying to fix them).
The reports show that you have two 4gB ram sticks, and that all 8 gB are recognized in the systeminfo.txt report
As for what's being used, you'll have to familiarize yourself with the different type of memory that each utility displays.
Taskman...Processes tab shows "Total physical memory reserved by individual processes"
Taskman...Performance tab shows memory "In use", along with "Committed", "Cached", "Paged Pool" and "non-Paged Pool"
Resource monitor shows "used physical memory" - which may/may not be the same as "In use"
It also shows "Committed", "Working Set", "Shareable" and "Private"
In the olden days we used to guess that the missing "memory" was the address' that were reserved for hardware devices (such as video).
But that was related to the 4gB RAM limit of 32 bit OS's - so it may/may not be significant in this situation (depending on which memory stats you're looking at)
As for the slow boot and as for what's actually doing it, the easiest thing to try would be a "clean" boot.
If the problem goes away when using a clean boot, then the problem is with one of the things that was disabled when you setup the clean boot.
Here's a link on how to do it: http://www.thewindowsclub.com/what-is-clean-boot-state-in-windows
Edited by usasma, 02 March 2016 - 08:31 AM.