Aero isn’t running
If Windows 7 isn’t looking its best eg transparency has been turned off, then the Aero theme may not have been fully enabled on your system.
– Click Start,
– Type Aero,
– Choose the “Find and fix problems with transparency and other visual effects” link,
– Click Next to launch the Aero troubleshooting wizard.
It will try to identify and resolve and problems.
If it does not fix your issue try installing the latest driver for your graphics hardware.
However some Aero features may be disabled in the Registry.
For example, if Aero Peek does not work for you, launch:
REGEDIT, browse to HKEY_CURRENT_USERSoftwareMicrosoftWindowsDWM and enure EnableAeroPeek is set to 1, rather than 0.
However Windows 7’s troubleshooting wizards will fix many display problems while you watch