How to enable or disable software rendering in Internet Explorer 9

Automatic:

Enable hardware acceleration - click here

Disable hardware acceleration - click here


Manually:

To disable hardware acceleration, follow these steps: 

1. Click Start, and then click Internet Explorer.
2. Click the Tools icon in the upper-right corner, and then click Internet Options.
3. Click the Advanced tab, and then under Accelerated graphics, select the Use software rendering instead of GPU rendering check box.
   
   
   
4. Click Apply, and then click OK.
5. Close Internet Explorer 9 and then restart it so that the change takes effect. 

To enable hardware acceleration again, follow the previous steps, but in step 3, clear the Use software rendering instead of GPU rendering check box. 

Source: http://support.microsoft.com/kb/2528233