Your icon cache is probably still dominating. It will probaly go away after a few rboots, but try this:
Right-click a blank area of your desktop and select Personalize.
Click Display - Adjust Resolution.
Click Advanced settings - Monitor Tab
3. On the Colors drop down menu, select 16 bit.
4. Click Apply.
5. When Windows asks you if you want to keep these settings, click No to revert your color depth to 32 bits.