Authorization of my computer fails, can't sync applications

My computer is one of 4 authorized computers for iTunes store. I have downloaded some free apps and 1 bought app that I wanted to install on my iPod Touch (2.2.1).
I have tried:
* Deauthorize and reauthorize the computer.
* Restore back to Factory settings of the iPod Touch
* Clicking on each application under Applications and typed in my password. It responds that I have 4 of 5 computers authorized.
Nothing helps, it's like the authorization is not registered even if it says this computer is already authorized if I try to redo it.
The account I'm logged into is an administration account in Windows Vista so that shouldn't be the problem either.
Any suggestions?
Edit: Maybe this should be under "Installing and Using iPod touch Applications" but I could find a way to delete it or move it.
Message was edited by: BeatriceK

I said "Authorization of my computer fails, can't sync applications " in the heading but I can try to explain some more.
This is what I did
1. Selected an app at iTunes Store i.e. Flight Control and clicked "Buy" (or "Get App" when it was a free app)
2. Typed in my password for iTunes Store
3. The app is now under "Software" in iTunes.
4. Attach my iPod Touch via USB
5. It sync automatically and a popup comes up saying "Some of the applications in your iTunes library including "Flight Control", where not installed on the iPod "Béatrice Karjalainen's iPod" because you are not authorized for them on this computer."
I searched for solutions on this problem in this forum and people suggested that I should reauthorize my computer bu deauthorize and authorize again. I did that. It didn't help so I continue to search for a solution. Someone said htat I could double click on each application under "Applications" and type in my iTunes Store password there so I did so. When I double click on an app it says "This computer is not authorized for "Flight Control". Would you like to authorize it? And the rest of the ordinary authorization info. I type in my password and press "Authorize" get the following as answer "This computer is already authorized".
I try to sync again, the same as before, my computer is not authorized.
I can't use App Store on the iPod as my wifi-function on the iPod seems to be broken all of a sudden. It just stopped working a couple of days ago. (And I have problems with the battery that is uncharged when listening to audio books within less then 2 hours).
I run iTunes 8.1.0.52.

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Authorization of my computer fails, can't sync applications

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