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I run many apps concurrently and use Alt + Tab constantly. In fact, I prefer Alt + Tab to having multiple monitors. I mean, come on, you can only look at one thing at a time and this way I don't have to turn my head :-)

I recently installed Windows 7 and on my previous machine I had modified the Task Switcher window to show more icons without scrolling, but I cannot remember how. Do you?

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up vote 14 down vote accepted

Changing the number of icons show in the task-switcher involves editing a couple of registry entries. They are:

HKEY_CURRENT_USER\Control Panel\Desktop\CoolSwitchColumns
HKEY_CURRENT_USER\Control Panel\Desktop\CoolSwitchRows

Windows XP users can also use the Microsoft TweakUI Power Toy to make this change.
This informations was found on this site.

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Thank you! As I come across these little tips and tweaks I'm trying to get them into superuser so they will be easier to find. – Jim Clark Aug 28 '09 at 14:24
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Windows XP users can also use TaskswitchXP (like TrayIt, TaskswitchXP allows to minimize everything to the system tray), a real pity it doesn't work with 7 :( ntwind.com/software/taskswitchxp.html – Molly7244 Aug 28 '09 at 15:57
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Funny, I just moved to a new machine at work and wanted to do this, having forgotten I posted it here :-) Unfortunately this is working for me on Windows 7. I changed the entries but the UI is not respecting the setting :-( – Jim Clark Dec 15 '10 at 19:42
    
Same as @JimClark over here. This answer seems not to be correct for Windows 7. – Sopalajo de Arrierez Apr 28 '15 at 4:39

Another alternative to Windows own task switcher could be TorkilsTaskSwitcher.

TorkilsTaskSwitcher is a utility, which provides an alternative, replacement or supplement to Windows' Alt-Tab invoked task switcher. Particularly for keyboard enthusiasts.

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Try VistaSwitcher. It's free and highly configurable alt-tab task switch replacement. It works on XP, Vista and Win7.

Screenshot: VistaSwitcher Screenshot

More screenshots.

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The answer of @heavyd did not work for me in Windows 7 SP1 Ultimate for the thumbnails Aero mode.

But I have solved the Columns/Rows matter by using Alt+Tab Tuner (freeware and portable, no installation required). Worked like a charm.

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