Hi gautam30,
Welcome to the Support Communities!
The article below may be able to help you with this.
Click on the link to see more details and screenshots.
Boot Camp Support Software 5.0.5033
http://support.apple.com/kb/DL1638
This download contains the Windows Support Software (Windows Drivers)you need to support 64 bit versions of Windows 7 and Windows 8 on your Mac.
For more information on which operating systems are supported on different Mac systems, click here.: http://support.apple.com/kb/HT5634
- The download file is a .zip file. Double click it to uncompress it, if it is not automatically uncompressed.
- Double-click the Boot Camp5 folder.
- Copy the entire contents of the .zip file to the root level of a USB flash drive or hard drive that is formatted with the FAT file systemFor detailed information about this update, please visit: http://support.apple.com/kb/HT5628
- When running Windows, locate the Boot Camp folder on the USB media you created in Step 3 and double click to open it.
- Double click on setup to start installing the Boot Camp Support Software.
- When prompted to allow changes, click on Yes and follow the onscreen instructions.
- Installation can take a few minutes. Don't interrupt the installation process. When installation is complete, click Finish in the dialog that appears.
- A system restart dialog box appears. Click Yes to complete the installation.
For more information on Boot Camp, click here www.apple.com/support/bootcamp
Boot Camp: Installing Windows 7 Frequently Asked Questions
http://support.apple.com/kb/ht3986
Boot Camp Installation & Setup Guide
manuals.info.apple.com/MANUALS/1000/MA1636/en_US/boot_camp_install-setup_10.8.p df
Happy New Year!
- Judy