Problem with ATI Raedon HD 5470 Graphics

I have ATI Mobility Raedon HD 5470 in my Sony VAIO laptop and it was running with old driver. My laptop was little bit slow so I decided to install the latest driver of ATI Mobility Raedon HD 5470. and I went to ATI Catalyst Auto detect page downloaded the latest one and installed. After installation it detected the display driver as ATI Mobility Raedon HD 5000 Series. After that it shows something Graphics driver stopped working.

After that I was unable to start most of programs (like VLC Player, Photoshop, Corel Draw etc). When I start any program it Crashes and shows stopped working so I thought that may be this is due to new driver and I uninstalled the latest version and re-installed the old version successfully. but the problem was still there. I tried so many things but it didn't worked then I took the help of superuser forum.

Windows 7 start-up repair disk works with dual boot

I was thinking that Windows 7 start-up repair disk doesn't work with Windows 7 and Ubuntu dual boot grub in case Windows 7 got any problem. I have Windows 7 Ultimate and Ubuntu 14.04 in my laptop.

Yesterday when I selected Windows it was unable to start. It was showing some file (.dll) missing I don't remember that missing file name. I used Windows 7 start-up repair disk and I was surprised it fixed the problem without causing any harm to Ubuntu 14.04.

Restore Windows 7 boot loader over Ubuntu/linux

If you have installed Windows 7 (any edition) and Ubuntu on your laptop or desktop then when you start your system the boot grub of Ubuntu appears and asks for selection of OS for start either Ubuntu or Windows.

In case you want to remove Ubuntu/linux from your system then if you delete the partition of Ubuntu by logging to Windows then your system will be unable to start and it will ask for grub rescue.