Problems with upgrading from parallels desktop 4 to 5

I have just tried to up grade parallels decktop 4 to 5 and I keep getting this error:-

The amount of video memory is too low.

The 3D acceleration support is enabled for this virtual machine, but the amount of video memory allocated to it is lower than 256 MB. You are highly recommended to increase the amount of video memory for optimal 3D performance.

Can anyone help on how I can get parallels 5 to work???

Lowey58

 

3D acceleration video memory

I get the same message when I open Parallels. What's up with this?