I have recently set up a new install of Windows 7 and I have just noticed that when alt-tabbing I am not getting Aero-Peek previews as I am accustomed.

I have checked to make sure that aero-peek is enabled in both the taskbar properties (and taskbar icons do show previews!) as well as in system performance settings. Both are enabled.

I even looked at a couple of registry edit solutions, but the key I am supposed to edit is not present (adding it did nothing). Even Alt-Tab Tuner hasn't solved the problem.

Any other ideas?

  • Have you installed the latest graphics drivers? – Mr. Hargrove Sep 29 '16 at 17:46
  • @Mr.Hargrove Yes. The driver was issued two weeks ago. – Draco18s Sep 29 '16 at 17:51
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    and you've tried looking in the registry for: HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM See the right side, you'll find a DWORD value called EnableAeroPeek and set it to 1? – Mr. Hargrove Sep 29 '16 at 17:55
  • @Mr.Hargrove It is already set to 1. – Draco18s Sep 29 '16 at 18:09
  • one more troubleshooting step: support.microsoft.com/en-us/kb/976170 – Mr. Hargrove Sep 29 '16 at 18:16

You may try to perform a clean boot on the computer and check if any of the 3 party programs are causing the problems. Make sure that you put the computer back in normal startup after clean boot troubleshooting.

To perform a clean boot on a computer that is running Windows 7:


  • Sadly...that didn't help. Even under a clean boot I didn't have aero preview during alt-tab. – Draco18s Sep 29 '16 at 18:36
  • @Draco18s What version of Windows 7 are you using? – Mr. Hargrove Sep 29 '16 at 18:47
  • Windows 7 Pro. And yes, it was legally purchased. – Draco18s Sep 29 '16 at 19:40
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    Thanks. And yeah, when I noticed it I was like, "that's odd" and everything I knew about it and everything I could find didn't work. I am not even positive that it was ever working correctly. – Draco18s Sep 29 '16 at 20:25
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    I go gaming for an evening and I come home to find that it works now. WTH. Only thing I can think of that I did after getting home that would have even come close to affecting this was rebuilding the icon cache (because a program in my start menu had a generic icon, rather than it's program icon). – Draco18s Sep 30 '16 at 4:50

I have both discovered the cause and the solution to my issue. I had wondered about the cause earlier, but it was such tenuous speculation I didn't even mention it.

Installing Dropbox broke Aero Peek.

Fixing it requires doing the following:

Does not appear that the order matters, as the first time I fixed it I'd previously restarted the computer to no effect and as soon as I rebuilt the icon cache, it worked. After reinstalling Dropbox (in an attempt to get it to locate its executable anywhere but the C drive), rebuilding the icon cache was insufficient and as soon as I restarted the computer, it worked.

Computers run on black magic. That's the only explanation as this entire series of events makes no sense.

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