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At work, I have a Windows 7 PC, but some features are missing, like some shortcuts Windows+Tab and others. Can anyone tell me if there is a registry setting to disable this feature, or a stopped service?

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If I'm not mistaken, the Win+Tab shortcut you mention is a feature of Aero, which may be disabled if your work machine has low-end graphics hardware or you are using a virtual machine or RDP session.

This article should help you determine if Aero is your issue.

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At work I have a win 7 pc, but some features are missing if there is a registry setting to disable this feature

so you want to be able to see everything It may not have been loaded if its a work computer. just click start button and search for what you think is missing and see if you can turn it on but only if you have Admin rights.

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I am an local admin – Remus Rigo Jul 19 '10 at 17:33
up vote 1 down vote accepted

i just went to Control Panel\All Control Panel Items\Personalization\Window Color and Appearance, unchecked and re-checked the checkbox "Enable transparency" and now it works fine

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Easy Aero Fix

In Start, type Aero and click Find and fix problems with transparency and other visual effects.

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may be you do not have the "Desktop Experience" feature installed. also, after check/install this feature, you should go to the System Panel and run the graphic card validationg process, then win7 will setup the Aero for you.

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There is a group policy setting to disable Windows key shortcuts. That is something which is configured by your system administrator. There is also a policy to specifically disable windows flip (Win+Tab). You may want to talk to your system administrator and see if they could enable those settings.

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