What system specs and OS Arjun? This is not exactly answering your question, but it would probably have been better making space on your boot drive by moving OS and Cache type files to the other drive, and kept all your apps on the boot drive. On the other hand, without actually researching it, you might fix your problem by simply reinstalling the Extension Manager.
Have to dash. Will look again later
Thanks for the quick reply.
I am using Photoshop CC in Windows 8.1 with 8 gb Ram and intel i5 processor
I am going to re install the extension manager. I will share the results in minute.
Sir, Thanks it works now..
Glad that fixed it, but if this came about because you are short on space on the book drive, there are other and better options.