Where are you entering your search?

• Firefox built-in home page (about:home)
• Firefox search box (the one with the search engine icon drop-down on the left side)
• Address bar
• Google.com

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems (e.g. google.com and local google site):

• Tools > Options > Privacy > Cookies: "Show Cookies"

You can try to click the Google in English (Google.com) link at the bottom of the main Google search page (www.google.co.in) or use this link:

• http://www.google.com/ncr