Computer experts. Please help me!?

[PaU = )]

Hi! I bought this laptop (Vaio Eseries) 2 months ago. I got anti virus trend mirco titanuim. So my problem is, all of a sudden this thing pops up everytime I turn on my laptop. It says:

Mircosoft visual c++ runtime library Runtime Error, This application has requested the runtime to terminate it in an unusual way.

On top of that, i cant open my itunes anymore. I tried uninstalling it then reinstalling it, but it still doesn't work.

Also, I use google chrome. I have all of my passwords for facebook and yahoo and tumblr and twitter saved. But now I have to log into everything everytime I use the internet.

I tried downloading a free cleaning thingy for my laptop and it said I had more than 2000 threats. About a thousand of it is in the registry and the other is in the junk blah...

Please help me. I dont know anything about laptops or computers. I call things thingies and other things I don't know blah... so as you can see.. I really need help...

Thanks in advance!