One possibility for this occurrence may be a certain NVIDIA driver Microsoft Windows Update is trying to install for you. Once the Windows updater has finished downloaded updates for you, be sure to click on the “notes” button to see if an NVIDIA driver is waiting to be installed. If you do find a NVIDIA driver waiting to be installed via the updater, uncheck the option to install it and hit cancel. It is best not to use a GeForce 4 driver with the GeForce FX series line of vide cards, as you may lose functionality of the FX card with an older NVIDIA driver set. If you continue to have continued lockups with the Shrouded Isles client and a GeForce FX video card, be sure to call our technical support representatives for further assistance.