WinEth supports AMD and NVIDIA video cards with at least 6GB of memory.
WinEth also requires Windows 10. You can upgrade to Windows 10 here.
If you believe your card should be working the first thing to do is install updated drivers manually.
For NVIDIA go here and select your card to download the latest:
For AMD Radeon, get the latest drivers here:
If your hardware is unable to mine Ethereum you should consider Monero mining with our new WinXMR miner.