How to get back launch bar and top bar after ubuntu 11.04 (Natty) upgrade

I am having problem with my launch bar and top bar after upgrading to ubuntu 11.04

I did the following procedure to fix

Press alt+ctrl+f4

then enter userame and passpord if prompted and the type the following command

Unity –reset

But still facing same problem no solution..
> even when I did ths procedure get some message : unity service not found..
Need help….