My computer won't open .exe or install most things downloaded.

[kousetsu]

Hello everyone.

I've been googling and googling ang googling about this issue since I got this computer, I cannot for the life of me fix it, and I am about to go pay a man down the road to fix it because to me, it is a hardware issue, but I am exhausting all options before I have to go and spend even more money.

I bought a computer online, I wont say the store as the owner is literally insane, but he insists what I am experiencing is a software issue, and therefore won't help (I've had the computer two weeks at time of writing) so please can someone help me! I'm incredibly frustrated.

When I first got the computer I went and did what anyone would do - I installed chrome and went off to look for anti viruses.
Download AVG - click install - nothing happens. No error. Just nothing.
Same with Avast.

Obviously, I have managed to install chrome, but nothing else will install.
Updates will install.
I have done a recovery when I first uncounted these problems,

 

[kousetsu]

Sorry, I seem to have posted this twice! if an admin could delete this it'd be awesome