My mac air is not responding on guest log in

on log in with guest users the system is not responding, even i have to force shut down the system

Hello, biswajit68. 
Thank you for visiting Apple Support Communities.
Here are a couple troubleshooting articles I would recommend going through that may help resolve this issue.
Using Disk Utility to verify or repair disks
http://support.apple.com/kb/ht1782
About Disk Utility's Repair Disk Permissions feature
http://support.apple.com/kb/ht1452
Cheers,
Jason H.

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