Hi fahad00100,
Thanks for visiting Apple Support Communities.
If you are not able to install OS X due to this error message, first try verifying or repairing your hard drive using Disk Utility. See the "Try Disk Utility" section of this article for helpful steps:
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/TS1417
If Disk Utility says that your hard drive is working normally, next try the troubleshooting steps in the "Top troubleshooting tips" section of this article:
Software installation Quick Assist
http://support.apple.com/kb/ht1148
Best Regards,
Jeremy