Issues Coming Up Since Installation Of Windows 7/

I've recently upgraded from Vista to Windows 7 using the x64 version.I've had hardly any improvements in performance that even amount to the problems I've been having. Perhaps it is due to hardware issues or if it is my computer being outdated. I am running a 2009 Asus i7 CG5290 computer, which came with Vista.my issues are:

1. Randomly my keyboard will blink and my mouse will stutter, and I cannot type without the keyboard acting on its own. If I enter a sentence the registry for space will go out and other times I will have eeeeeeeeeeee typed when I pressed e once.

2. Occasionally my internet will go haywire, dropping from 20 mbps to 1.3 mbps. These spikes are incredibly annoying and when they do occur, the above issue happens and my mouse pointer will be freezing around everywhere.

3. My computer will freeze, often playing MW3 or watching a video, and a loud, very eerie buzzing noise will start up, and a blue screen will occur. I have not been able to further ***** the blue screen because the information that pops up will disappear as my computer shuts off almost immediately.

The first and second issues usually fix itself temporarily if I do a hard reset on both my computer and modem/router. The third issue has prevented me from playing games on Steam, as my internet connection always blows out after playing for a few minutes. I'm thinking that I have a virus, but Malware Bytes hasn't given me any positives.If there is any other information I can provide to help resolve this issue, please do not hesitate to ask.