I accidentally uninstalled the Microsoft virtual hostednetwork drivers from the device manager as it was non functional....

And now I am unable to find it back......

I'm searching on the internet for three days,but didn't find....

please tell me how to download and install it back please help...

You could run the System Restore to get your computer back the when it wasn't uninstalled.

http://windows.microsoft.com/en-us/windows-8/restore-refresh-reset-pc