A3d.dll errors can be caused due to a number of reasons like when the file gets overwritten by windows updates, when the drivers gets incompatible with the system, virus attack or registry issues. In case if the error cause is outdated drivers, you can go for driver updater software that is especially meant to update the drivers. If there is registry problem, then you must use registry repair tool which will remove out all the registry problems in an efficient manner without taking much of your time. You just have to follow only few steps and A3d.dll error can be resolved completely and efficiently. For more info http://www.a3ddllerrorfix.com