Dear Sir i am having desktopof acer powerentra andthe system is AMD(DURON), I am not getting the vga for this system.please suggest.

Right click "my computer" and select "properties" then click on "Hardware", Inside the hardware, select "Device Manager"
Inside the Device Manager, see whether there is a yellow Question mark before the start of any name, If there it will be the driver which either not there or not updated. Right click that driver and the first option will be update Driver. Select it and it will ask you to update automatically, select it and it will search on the internet for the best available driver for your hardware. If there was more yellow Question marks with the items in the Device MAnager, then repeat the same process with all. If ther was no Yellow Question mark, then select "Sound,video and game controllers" and select for the option of sound it in and right click it, and select uninstall driver. Once uninstalled then Inside the control panel, select add new hardware. and follow the steps which come in your way. If no yellow question mark, then once the Device Manager is opened, right click the first thing written inside the box, and the option will come " scan for hardware changes" click it, and u may find something like , Found new Hardeware, and it will start seraching for the drivers automatically using the internet