Specs: Intel Core i7 720M Windows 7 Ultimate x64 bit Genuine 8GB DDR3 RAM ATI HD 6870 Graphics
It doesn't matter what plan I run my computer on, my computer (sometimes) can be extremely slow. Whether I have only Firefox open or I'm playing a lightweight game on Low graphx, it doesn't matter. I have 0 viruses (I have Norton and I did a full scan 5 minutes ago). My HDD is fine only around 100GB used (1tb memory). Please let me know.
PS its not overheating. I have a cooling pad on when I use it and I installed diamond cooling.
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Tempted just to say that Norton is killing your machine. I once installed it on an overclocked dual core machine, 4GB ram and SLI (old rig now) and it brought it to it's knees every few hours. I ended up getting rid of Norton (for good) and using AVG - no more issues.
Make sure Norton doesn't have any type of auto-scan or auto-update settings active as I know it LOVES to update itself randomly which it somehow makes one of the most CPU-hungry operations.
You might also want to disable any automatic "under-clocking" settings in your BIOS so your CPU doesn't randomly drop.
Yes probably Norton is killing the PC. Uninstall it, then download a free AV program (i recommend Avira Free) and see if it'll "fix" the problem.