Vista - Every program related to Vista, isn't working

So, I've been trying to install Windows 7. That's when my problems started.
I was trying to upgrade from Vista, at the compatibility report it stopped, gave me only an option to close. Blank report.



So I tried this again and again, but it didn't work. Then my Windows Media Player stopped working. I downloaded Winamp, but still, I didn't like a component of Vista to not work at all. So I searched the net, googled and found millions of solutions. One was bound to screw my OS up. And it did. So I learned the hard way, don't tamper with the registry, unless you know what are you doing. Yay, I got my WMP working, but every other Windows program or such, gives me an error:



It says I don't have enough storage available to perform this operation. Any kind of operation.
So, my audio isn't working, I can't restore my sistem, my internet connection says it's down ( of course it isn't, or I couldn't be posting here ), I can't sign into Windows Live Messenger, Windows Update isn't showing any updates, and if I boot the Vista DVD, it takes forever to load Windows files, but if I still try to upgrade to Win7, it says it can't read from my disk. Every audio file I want to play in WMP or in Winamp, well it just doesn't. I can't install Service Pack 2, or start the Windows 7 Upgrade Advisor.
Once I get pissed, I will do a clean install of Win7 ( if I can ), but if there is anyone, that can help me on Vista, please reply. I'm running out of ideas, and patience.

Thank you.