google homepage unknown string at address bar

gandhisanju

Right off the assembly line
I kept google.co.in as homepage at opera 12.16 and windows 7.when I go to google.co.in from new page shortcut the site navigates to google.co.in and some new unknown string at address bar each time for e.g"*www.google.co.in/webhp?tab=ww&ei=x9yUUtiJKsm3rgfcq4GoBA&ved=0CBMQ1S4"
my question is is this normal or any virus is there?I use AVAST free edition
 
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