Windows 7: folders' taskbar icons issue

I compressed the files on my System drive to gain some space, and now my folders icon looks like this in the taskbar:

I KNOW there is a very easy way to set this icon back to normal, since it already happened to me once a while ago, but I can't remember what it was...?!

thanks!

[EDIT] Deleting the IconCache.db file solved the issue:

1. Open Windows Explorer, and configure your Folder Options > Views to show Hidden / System Files


2. Go to C:\Users\\AppData\Local folder


3. Delete the hidden IconCache.db file


4. Reboot

I knew it was easy!

Answer

Deleting the IconCache.db file solved the issue:

1. Open Windows Explorer, and configure your Folder Options > Views to show Hidden / System Files


2. Go to C:\Users\< User >\AppData\Local folder


3. Delete the hidden IconCache.db file


4. Reboot