I have got OpenSUSE 11 installed on my HP Laptop
It worked fine so far
I installed some software
and after a little time I rebooted the system
And I found the desktop to be completely different
There is no taskbar..no menu
There are a host of error messages being displayed
some which says ....
not able to locate gconfd
not able to connect to...something like that
for every action i do(eg i open a window)
These internal error messages are getting displayed
And normally before openSuse desktop opens that sound and one screen used to come but now nothing like that is getting displayed

Any clue what the problem is??? and any solution

Somebody please help me recover the original state

What is your desktop environment?What software have you installed just before the problems started and how?

friend
my desktop is gnome
and i installed Qt4.5 by unpacking it in /tmp directory

Well uninstall it again using the login of a other user or root

You can read about gconf here.You can find useful things there.
Maybe you should create new user and see how things work then.
If that doesn't help,then please post all the errors here.You can check /var/log/messages for some info.