After putting/accessing a DVD in the drive, while opening the putty.exe it is giving the following error message.
PuTTY Configuration: There is no disk in the drive. Please insert a disk into drive D:.
It looks like the issue/curruption happened because of some temporary change to the registry or configuration. Before going to the more troubleshooting or finding out the configuration changes I have done the system reboot and which resolved the error permanently.