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Is there any way to get rid of the taskbar thumbnail previews on Windows 7 once and for all?
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Is there any way to get rid of the taskbar thumbnail previews on Windows 7 once and for all?
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You may try this:
It should work.
2"Always quote the most relevant part of an important link, in case the target site is unreachable or goes permanently offline." – and31415 – 2014-05-17T17:33:49.823
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If nothing else helps 7+ Taskbar Tweaker will for sure:

You'll need to keep it running, but it's quite a light-weight app and a portable installation is possible.
the bad thing about this is that it needs to be running – Andres Guzman – 2013-06-17T17:30:53.520
Yes, I already mentioned that clearly. However I find it so useful that I don't really mind, and it's not too heavy. I love the latest feature that's been added to display seconds in the tray clock. You can see other ways to use it from my previous answers.
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Snip from reference below (Edit: THIS APPEARS TO ONLY WORK FOR Vista): How to Enable or Disable Taskbar Thumbnail Preview in Windows 7
Reference here
Edit: For Windows 7:
Taskband folder -> New -> DWORD 32-bit valueMaxThumbSizePxI've tried this method with out luck, I don't really know what the cause is. – Andres Guzman – 2013-06-14T18:34:06.790
@Oily Looks like it's going to require a registry edit. Interested in that as an alternate answer? – panhandel – 2013-06-14T18:46:12.903
@Oily ok, check edit. This is as good as it appears to get without disabling the aero theme. – panhandel – 2013-06-14T19:10:22.543
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The best solution I have found is to go into this registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Then create a new DWORD value called ExtendedUIHoverTime with a value of 20000. That's supposed to cause a 20 second delay before the preview pops up, but for me it stopped it from happening entirely.
Source: answers.microsoft.com
Would be nice if you added more details, like 32bit and 64bit dword values, whether 20000 is a heximal or decimal value etc. – Alph.Dev – 2016-11-10T09:13:14.090
@Alph.Dev: The exact value doesn't really matter (hex or not) - any sufficiently large value will delay the thumbnails long enough that they are no longer a problem. 20000 as a hex number is 131072 decimal so worst case you'll disable the thumbnails even more so :-) DWORD is always 32-bit in the registry, a 64-bit value is called a QWORD. – Malvineous – 2016-11-11T01:44:18.570
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If you mean that you want to disable the Aero Peek feature (Where you see the preview of whatever the running task is when you hover your cursor over it), these are the best instructions I've found:
http://www.howtogeek.com/howto/5473/make-aero-peek-display-instantly-or-disable-it-in-windows-7/
Strangely, unchecking only "Enable Aero Peek" and even logging off and logging back in or restarting did nothing for me on Win7, since the thumbnail previews still show up. – Karan – 2013-06-14T23:58:49.430
You mean Aeropeek? – MDT Guy – 2013-06-14T17:56:40.747