Display problem

When i am running windows 7 in lenovo A70 desktop [Intel G41 Chipset mother board], suddenly display is off & Message comes as display driver stopped responding and has recovered display driver intel graphics accelerator drivers for windows stopped responding and has successfully recovered & also we can't save any file if we are working in excel or word or any other applications.

Sounds like a corrupt graphics driver of some kind. First try re-installing the chipset driver from Lenovo's website. Generally the onbaord graphics driver is with the chipset driver along with LAN driver and a few others depending on the vendor. With out the specific make and model number...hard to locate your exact drivers.

http://support.lenovo.com/en_US/downloads/default.page?