Not sure what your problem looks like exactly, but I have the similar to what you are describing. I think it is just Aero effects that give windows a slight fade in and out.
If you want windows to open/close instantly, do this:
1. Right click Computer
2. Click Properties
3. Click 'Advanced System Settings' in the left menu
4. Click the Advanced tab
5. Under the Performance section click 'Settings'
6. Untick 'Animate windows when minimizing and maximizing'
This will make minimizing, maximizing, opening, and closing windows more snappy
Thanks a ton, that fixed it.
One more thing, I am on Google Chrome, and when I am adding more tabs, it is adding the tabs slowly , like its stretching it.
How to fix that ?