i have zune in my pc and when ever i check for update it say it is upto date.7.10
All my friends have moved to 7.8 but i am not getting the update in zune
Someone is wrong here because your phone should be getting the WP7.5 update even if WP7.8 may not be available yet. Try uninstalling and reinstalling Zune on your pc. If that does not work, I suggest you get it updated at your local Nokia Care Point.
You can locate your nearest care point using the link below.