Bad system config info, BSOD after changing boot settings

Hello all,
This is my first time posting here sorry I wasn't able to use the lovely SF tool Being a noob I may ask stupid question. Please forgive ;p
today when I played my favourite game ( entropia universe), I got a message from my game saying that I have low ram, I checked on the Ctrl alt del thing and I was shocked that only 3.8 gb ram was usable when i have 8 gb ram and using 64 bit system. So here comes to my first question... Why would this happen?
so I happened to follow a tutorial and turned on the maximum ram checkbox in the advanced settings in boot tab in msconfig. However when I first reboot I got the session 3 initialisation failed BSOD. The second time and third time and so on and so forth I got bad system config info, which turned my computer into a reboot loop. Second question, why would this happen?

My experience similar to this unlucky fellow
http://www.eightforums.com/bsod-cra...system_config_info-details-available-sos.html

so I followed the guide in the thread and tried to recreate my BCD. I successfully got into the advanced setup options ( I think it is called this ?) by pressing shift +f8. Lucky...
however I still failed as I was locked there. Every option including opening the command prompt is blocked because it said that operating these options needed administrative rights which I have in my hands. However the ASO said that it can't find any administrative accounts in my computer. Third question , why would this happen?

so now my computer fell into another loop. Whenever I started my computer it went into the ASO and wouldn't get away from it. And can't even see the lovely face in BSOD

i am am using windows 8.1 in amd fx 8150 and 8 gb ram, computer was somehow normal with occasional freezing ( 1-2 times a month )

thanks in advance

Updates:
1. As I was able to boot into ASO, I can get the screen showing options 1-10 in which I can select safe boot. However, even if I boot with safe boot, the ASO still showed up as a loop as described in the main thread. The BSOD wouldn't show up, safe mode wouldn't show up, now only ASO will automatically show up.

Take Ram out of machine. Put back in and ensure seated well.

MasterChief said:

Take Ram out of machine. Put back in and ensure seated well.

Click to expand...

I don't mean to question you ;p but could you please tell me why a software setting could be corrected by a hardware method?
thank you