Exactly which ATI cards are you using, and how much memory on the cards?
If you have a dual core system and over 1 GB of RAM you could try the SMP program. I got tired of fighting Vista to keep it running so I now load two folders of F@H on my dual core systems, F@H1 and F@H2.
Copy the F@H console 6.01 beta into each folder, then run each one.
You will get a DOS box where you can put in thomasthomas, team 36120, no to proxy and IE, but yes to Advanced Options.
Hit enter to accept the default choices until you get to “Use advanced scientific ...” and select Yes.
Make sure that you chose No for deadlineless core. They are not used at this time.
When you come to the section that says machine ID 1: select “1 for F@H1. Let it download and run for about 10 minutes.
Go to folder F@H2 and repeat the process, except this time enter “2” at Machine ID. Let this box run for about 10 minutes.
Close both DOS boxes and restart the system. They will be running in the background and F@H will assign the work to each core, from each F@H folder.
Please let me know how it goes!