robencc

Hello all, I have installed Microsoft office 2007 on one client machine.it was working perfectly before. now the problem is when click mouse right button from desktop and select 'New" i am not getting "Excel" to create excel file. in the same machine when i logined with other user i am getting full options.so this specified user not getting excel. so i tried to change registry, but no luck.but when i change in registry under HKEY_root , if i change .xls i am getting 97-2003 option to create. but i need 2007.. any one can help me for this?? Thanks