Solved Windows cannot detect my Graphics Card [IMPORTANT]

Hey guys,
This is an important post for me as its regarding my Graphics Card (as i use it a lot). I have a Lenovo G400 laptop with intel i5 3230m , Windows 8.1 and Switchable Graphics(Intel HD 4000 and AMD Radeon HD 8750m). Recently this morning i kept my laptop for an download and went away from it for a while.Later when i returned i saw that my laptop was on lock screen. I unlocked it to see for the download and it said that could not detect hardware or hardware drivers for my AMD Graphics card. Later i saw it could not even detect my intel graphics card. I managed to download and install intel graphics card and it could detect it but when i tried to install amd grahpics drivers it failed.
It cant even detect the AMD Graphics Card.I tried a system restore and it didnt work. According to me it was due to an windows update recently(so i did a system restore).
This is pretty Important for me , so please reply all the suggestions you have
Thanks

Well The Following Error is Solved. All i did was pray to god and shut down the laptop for a few hours after trying every thing and somehow it worked