Installing and then uninstalling iTunes has slowed Win7 PC

I installed iTunes on my newish Win7 PC but had a problem with the PC being 'not authorized'. Despite many many hours of reading Apple help and Googling I could not resolve the issue. Decided to give up on iTunes and stay with Windows Media Player. Uninstalled iTunes and now my PC is running slower than before the iTunes install/uninstall.
Apple, I am not happy that your software has messed up my PC.

Thank you both. I suppose I should have prefaced my question with the concern that I've read a number of other posts from people who have had a similar issue and when they tried to follow the directions, they ran into a multitude of other problems. As you might imagine, I'm hoping to avoid the creation of new problems as I try to solve this one. Thanks again.

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TS5376 Does uninstalling and then reinstalling iTunes affect the number of authorized computers listed for my account? When I reinstall, is iTunes considering my computer a new authorized device even though it was installed before??

Hello,
When trying to install the recent iTunes update, I got the Error Message "Program can't start because MSVCR80.dll is missing from your computer." Apple's recommended solution involves the step of uninstalling and then reinstalling iTunes on my laptop. I'm concerned that when I reinstall, iTunes will think it's a new device and use up one of the 5 device authorizations the iTunes accounts allow. Do I need to do anything in particular to prevent that? If yes, what should I do?
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Actually, I'd use the following user tip rather than the Apple document as a guide. (At the time I'm writing this reply, the user tip is much better organised, more accurate and way more up to date that the Apple document.)
Troubleshooting issues with iTunes for Windows updates
In the normal course of events, and uninstall/reinstall doesn't affect your number of authorisations on a computer. Usually, it requires a serious hardware change (like a new hard drive or motherboard), or a BIOS update, or an upgrade to a different Windows operating system to confuse your iTunes and make it think that it is now installed on a different computer before you end up using extra authorisations for the same operating system for the same computer. (So if you ever have to do things like major hardware changes, or BIOS updates on the computer, deauthorise the PC first, and then reauthorise after the change has been carried out.)

I am trying to download iTunes on my new desktop computer (Windows 7, 64 bit). It starts installing, and then stops with the message- "The System Administrator has set policies to prevent this installation." I am the sole user- please help.

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e. Click Ok and restart the computer and check if the issue is fixed."

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Thank you both. I suppose I should have prefaced my question with the concern that I've read a number of other posts from people who have had a similar issue and when they tried to follow the directions, they ran into a multitude of other problems. As you might imagine, I'm hoping to avoid the creation of new problems as I try to solve this one. Thanks again.

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Installing and then uninstalling iTunes has slowed Win7 PC

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