Hey Vishnu,
This seems to be a driver issue. Amd Radeon HD display driver needs to be reinstalled in order to fix this issue.
I would suggest you to go to device manager and uninstall the Amd Radeon HD driver by right clicking on it and click on uninstall.
You may be prompted to uninstall the device software. Press yes to continue.
Once you uninstall the driver, you may be asked to restart the computer. Do not restart.
Go to Programs and Features in Control Panel and check if there is any software related to AMD shown in Uninstall a Program window. If yes, then uninstall it and restart the computer.
Go to the following website and then download the driver based on the computer model type
Once the driver is installed, restart the computer.
Go to device manager to confirm if the driver is installed successfully.
For more info on Code 43, see http://technet.microsoft.com/en-us/library/cc725873(v=ws.10).aspx
Hope this troubleshooting may help. If you have any concerns, please let us know.