xlsx file not opening in excel 2010

Dear All !!

Few days ago I installed office 2010 after uninstallation of office 2003. Every thing was working fine when i was logged on as administrator.

But when i logged on as standard domain user I was not able to open .xlsx file on double click while .xls files when opening properly by double clicking in excel 2010.

All other user are working properly. Pls suggest me some solution in this regard.

Thanks