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govind v 3govind v 3 

Login issue,unable to understand "Failed: Computer activation required" error.Please any one help me why this is causing

Please find the screenshot for login history of the user
Khan AnasKhan Anas (Salesforce Developers) 
Hi Govind,

Greetings to you!

Salesforce utilizes the local browser to cache logins. This process updates the browser itself upon successful verification. Thus, if your browser blocks or removes its browser data, you will be repeatedly prompted to verify at the next login. You may review the change further via this Article:

https://help.salesforce.com/apex/HTViewSolution?urlname=After-Spring-16-why-am-I-asked-for-Identity-Confirmation-Verification-code-on-every-login&language=en_US

There are 3 different ways to prevent these prompts: (you only need to implement one of these options)

1. Update the Network Access of your org with all approved IP ranges. This will resolve the issue entirely for anyone signing in from those approved addresses. https://help.salesforce.com/apex/HTViewHelpDoc?id=security_overview_network.htm&language=en_US

2. Login IP Restrictions can be added for each individual profile to limit the access of those users to a known set of approved ranges.

3. Lastly, you could simply ensure that your users are not clearing their browsing data, or that the browsers are not clearing the data upon browser close.

Reference: https://success.salesforce.com/answers?id=90630000000DQZa

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas