Sometimes when you open Desktop Personalization window in Windows 7, you might get presented with blurry thumbnails for all Aero themes as shown in following screenshot: 
It seems a bug in Windows 7 and occurs randomly. It happens due to corrupt thumbnails cache in system.
To fix this problem, you just need to follow these simple steps:
1. Open "Disk Cleanup" from "Start -> All Programs -> Accessories -> System Tools". You can also open it directly by giving cleanmgr.exe command in RUN or start menu search.
2. Select system drive from the list where Windows 7 is installed in your system.
3. Now check the option "Thumbnails" and click on OK button.

4. It'll clear the corrupt thumbnails cache and your problem should get fixed.

It seems a bug in Windows 7 and occurs randomly. It happens due to corrupt thumbnails cache in system.
To fix this problem, you just need to follow these simple steps:
1. Open "Disk Cleanup" from "Start -> All Programs -> Accessories -> System Tools". You can also open it directly by giving cleanmgr.exe command in RUN or start menu search.
2. Select system drive from the list where Windows 7 is installed in your system.
3. Now check the option "Thumbnails" and click on OK button.

4. It'll clear the corrupt thumbnails cache and your problem should get fixed.
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