Lag/Boot Problems on my Acer Aspire Machine

Basically my Desktop used to BSOD a fair amount about 2 months ago and for some reason it stopped after i applied new thermal paste and hoovered the insides of the case

Anyhow - as of late , my pc has started having "random lag" what i mean by that is that my computer will be running fine at normal speed on everything im doing then all of a sudden, everything will take an age to do like open folders , open my web browser etc and even youtube videos will slowplaying - just everything goes into meltdown lol and i have to restart to make it usable again

Ive tried previous suggestions from other people such as using Memtest+ on my ram sticks and also tried wiping my HDD and reformatting it and installing Windows 7 again , bear in mind ive had this pc for almost 4 years and it never done all this lag business before just a random bsod now and then which didnt really cause any issues

Someone also suggested checking event viewer, which i have, and nothing there, also i was suggested to install one program at a time until i have problems but i cant see how it can be a program issue since ive used a multitude of programs before and it never used to do this and was also suggested to do my Windows updates which i did but to no avail

It used to "random lag" quite often but does it a fair bit less now but the problem is still there also ive noticed that my pc can sometimes try to boot 2-3 times before it actually beeps and comes on

Also heres my BelArc Advisor System Profile: Please note that it will be missing updates as this is a new install

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-Sorry for the long post i just thought id try and explain everything-

Hope i can sort this with your help

Kind Regards

NC

Yeah i ran a scan with both Malwarebytes and Microsoft Security Essentials and nothing found

I agree that is the case :) and ill try the memtest later :)

do you have skype or something so i can add you to help me later ? if not ill just use this :)

Yeah keeping it all on here sounds smart , btw im still on the laptop but have moved it upstairs , installed Memtest+ to my 2gb usb with their auto installer and so far its done one pass with no errors and will report back after 10 , thanks for your help so far , tried a few sites and most people just ignore my post

I done 4 passes before i had to use my own pc again since i was borrowing laptop and no errors found in 4 passes and im going to run the Fix All Option in SeaTools right ? Or do i do another option ?