Error while Computing

You can always get an idea of the cause of compute errors by going to your account page, clicking on the 'view' link for your computers and then clicking on the 'tasks' link for the particular computer that has the problem. You can then select any task with an error and click on the 'Task Name' for that task. This will give you a listing of what was sent back to the project when the results were uploaded.

I've looked through a few and it would appear you don't have enough memory on the card or that there is a problem transferring between host memory and GPU memory. Your card is listed as a GeForce 310 with only 16 CUDA cores and 512MB of memory. I didn't think the project accepted work requests for GPUs with less than 1GB memory. Obviously it does :-). However, it's always going to be a struggle to have enough memory for crunching as well as for normal display purposes.

If you would really like to crunch GPU tasks, you should consider upgrading to a rather more capable (but still budget friendly) card with at least 1-2 GB memory. You could probably get something like a second hand nvidia GTX 650 or an AMD HD7770 very cheaply. They don't use much power but do need a 6 pin PCIe power connector so you would need to confirm that your current PSU is capable of supplying them.