ITunes auth problem on Windows 7 64-bit

Hi,
I experience weird issues with the iTunes auth-process on a Windows 7 (64bit) machine.
When I try to authorize my computer it results in a message telling me something about connection issues. Anyhow, it seems the computer is kind of activated since I can deauth my computer. If I try auth'in my computer several times, it also allows to deauth it several times until it says that it is not auth'd anymore.
My tries so far to solve this
- updated to latest iTunes
- deactivated, even uninstalled firewall (used NIS2011), also disabled the Windows Firewall after that
- checked hosts file
- deleted SC Info
- even tried with creating new library
- disabled User Access Control in Windows
- disabled all startup items in "msconfig"
- tried to activate with same account a different computer in the same network, I was able to play movies using the private home sharing feature, also activation was no problem
- re-installed Apple Software (including iTunes, Quicktime and Safari)
- checked Diagnostic within iTunes with no problems
So my guess is that it could have something to do with 64 bit or any hard- or software related issue at my computers side.
Detailed procedure:
1 - Start iTunes, click Store > Authorize > Enter credentials
and now the weird thing is that the "authorize" button says "deauthorize", no matter how often I try to deauthorize before.
2 - Repeated step 1 since it says always the same error message (connectivity alert)
3 - Playback of any DRM protected media does not work (movies). It asks for authorization again but fails to do so with the same message again
4 - Deauthorizing is possible and I noticed that I can do this as many times as I tried to authorize before.
Does anyone have a suitable idea for helping me out in this issue? I never had problems on my mac before, nor on a Windows 7 32bit system.
My 64 bit machine is only used with one iTunes account.
I already contacted the iTunes Support via Mail but they could not help me since this could be a technical issue.
Any help is much appreciated.
Thanks in advance,
Benjamin

After numerous calls with Apple support, I finally got it working
For me, the problem was the following:
1. Make sure that Internet Explorer is your standard browser for windows (if not...make it)!
2. In Internet Explorer go to "Internet Options" then "Advanced"
3. In the list scroll down to "Security" and UNCHECK "Check for server certificate revocation"
4. Make sure that (a bit further down) "Use SSL 3.0" and "Use TLS 1.0" are CHECKED.
5. Delete the "SC Info" folder once again... 
6. Run iTunes in Admin-Mode
After that, I was able to activate my computer and I changed my browser back to Firefox afterwards...
Hope that will help you too !!
Cheers

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