all applications crashing on launch need help

something really stupid recently started happening with my computer in which trying to play video of any kind would cause explorer.exe to crash alongside windows media player, skype to crash on system boot, and crash on launch when i try to reopen it up to 15 times, same goes for windows media center, internet explorer, STEAM (which claims the system is running it in compatability mode, which its NOT, com surrogate crashes during sony vegas renders, and sony vegas renders on GPU OR CPU stall randomly, a DLL for brawlbox.exe specifically ALWAYS randomly self destructs itself and i have to keep redownloading it to run brawlbox again, windows updats now fail, AND my antivirus says that there is NO infection and it is a HUGE pain in the ass to format the HDD, and reinstall windows, and have to reinstall everything, and pay for again software that I am out of activation limits for plus i lose al my files because i have nowhere to back them up on, I really need help, I am about to take my computer to the gun range and destroy the whole thing

additionally, litterally every application EXCEPT the system core apps, and google chrome will run, everything else crashes including unessential software that comes integrated with windows

i went for repair install, but im on windows 7 pro, not home, and my upgrade key to try getting the reupgrade running isnt being accepted anymore

Britton30 said:

Please read, Repair Install and try restarting the Repair.
I am assuming you have bought an Upgrade Edition DVD?

I used the upgrade key card, not the DVD so it wont even start the thing up

update on this junk:

its windows update is at fault for causing near total system failure at boot where everything just crashes and doesnt BOOT at all (except the OS)
repair installs FREEZE and rollback every time they are attempted after an update, even if the only update applied was "AMD video driver" only