I have the following problem on a Dell 450SE with the ATI Graphics Ultra Pro 
EISA:

When I start Windows, the first 5 times I try to run an application, it does
not start. Windows will show the following error message:

   Error Executing application. There is not enough memory to run the    
   application.

After the first 5 tries, the application I want to run will start, and 
afterwards there are no more problems. When I change the Video driver from 
Mach 32 to 8514/a, this problem does not occur, so I suspect the ATI 
drivers (I tried both the build 55 and build 59 driver).

Does anyone have a clue?
