Is Aero disabled/off?
To quote -
http://www.computerworld.com/action/...8&pageNumber=4
Windows Aero may add pizzazz to the interface, but depending on your hardware, it may also slow down your system. You can speed up your PC by turning it off altogether, or by turning off some Aero features but leaving others on. To turn off Aero:
1. Right-click the Windows desktop and select
Personalize >
Window Color and Appearance.
2. Click
Open classic appearance properties for more color options.
3. In the
Color scheme drop-down box, choose
Windows Vista Basic or
Windows Vista Standard, and click
OK. Aero will now be turned off.
What if there are some things you like about Aero, such as window animations, but others you don't like, such as transparent windows? You can turn off some Aero features to speed up your PC but leave on others that you like using.
To do it, select
Start >
Computer >
System Properties. Click
Advanced system settings, then, in the
Performance section, click the
Settings button. A screen like the one shown below appears. Select
Custom, uncheck those features that you want to turn off, then click
OK.