Random shut downs/freezing with downloading/playing games

[yokazuma0]

My computer just started doing this randomly....the first time it had shut down, it did it instantly as if i had lost power. So my first suspect is my PSU which is a 450w and all im running on it is a gtx 550 ti...so it could be faulty. But, whats getting me is the freezing/downloading problem. I'm using an outdated wireless adapter and some times when i download i get a blue screen saying something along the lines of "DRIVER_IRQL_LESS_OR_EQUAL". I'm trying to download a game on steam and it seems like its fine during lower MB/S but once it hits about 3MB it shuts down. So, i need to know if anyone knows what this problem is...or what i need to buy? please help!

What i have done to try and fix it: Complete reformat of windows 8 and installation of windows updates.

P.s.- I've been downloading and playing games just fine for years...this was out of no where. Could this possibly be a hard drive problem? they're my oldest hardware in my computer.

 

[yokazuma0]

Ok, so i reinstalled windows. Got sick of it. It's gone...now i have my old adapter plugged in and so far i keep getting blue screens during downloads. I'm still in the middle of updating my service packs and updates. I might look into an internal antenna wifi or drill through to the first floor of the house with a wire. Adapters are my worst experience with computers so far. Here's the minidump file of the bsod i just encountered https://www.dropbox.com/s/gfhsqbkb1m8f7zw/022614-30560-01.dmp