Hi Bhavin Lakhani,
Based on your description, I want to ask you several questions about your issue.
1. Did you get any error messages when you can't insert rows and columns?
2. Did this issue occur in all Excel files?
3. Can you delete rows and columns normally?
4. Does the Insert option in Excel work fine?
First of all I suggest you modify the Registry key, in the left pane of Registry Editor Window and please navigate here:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Excel\Options
Then please Delete Options key, and restart your computer. After rebooting the system, please check if it works for you.
Important Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
Please refer to this article about how to back up and restore the registry in Windows:
https://support.microsoft.com/en-us/kb/322756?wa=wsignin1.0
Please try this method and let me know the result.
I'm glad to help and follow up your reply.
Regards,
Emi Zhang
TechNet Community Su