Which of the apple applications install bonjour automatically?

Hello Prabha.N,

Thank you for the question. Bonjour is included as one of the components when iTunes is installed:

1. iTunes
2. Apple Software Update
3. Apple Mobile Device Support
4. Bonjour
5. Apple Application Support (iTunes 9 or later)

Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8

http://support.apple.com/kb/HT1923

Use the steps in the following article to tell if Bonjour is installed:

Bonjour for Windows: How to tell if it successfully installed

http://support.apple.com/kb/HT2703

Thank you for using Apple Support Communities.

Best,

Sheila M.