@josephselvaraj
Hello;
Allow me to welcome you to the HP forums!
HP does not provide downloads of recovery media; instead, you have to contact them and order physical media.
HP Recovery Media is a set of DVDs and a CD, or USB stick, that will erase the hard drive (removing all data, settings, and applications, reinstall the original OS, drivers, and some HP Utilities. In some cases, you may be able to order a USB stick instead of disks. You have to order these from HP; they can not be downloaded.
You can look online for Recovery Media starting with the linked paged: http://support.hp.com/us-en/drivers
Once there, input your Product name or number. On your Software and Drivers Download page, select your Operating System and and Version. Click "Update". If HP Recovery Media is available for your machine, down near the bottom of the page, you will see an entry for Order Recovery Media-CD/DVD/USB. Click the "+" symbol to expand that entry and click on Order Media for details.
Or, if you prefer, you can do the same by contacting HP Customer Service:
If you live in the US or Canada, contact information is on this page: http://www8.hp.com/us/en/contact-hp/phone-assist.html#section1
If you live elsewhere, contact information is on this page: http://www8.hp.com/us/en/contact-hp/ww-contact-us.html
NOTE: After you get through, stay on the line until you are finally able to talk to some one -- it can take a while!
If you have trouble finding a phone number, then try: 1 (800) 474-6836
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However, HP Customer Support is generally not available on the weekends, so you might have to wait until Monday to contact them.
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If HP no longer provides Recovery Media for your model, a couple of other sites you can check are: http://www.computersurgeons.com/ and http://www.restoredisks.com/
Before using the media, read through this: http://support.hp.com/us-en/document/c00006110
Good Luck
I am a volunteer and I do not work for, nor represent, HP