Strange error in display

Hi all
I am facing a strange problem with wordpress.
I installed wamp first which is good and then install wordpress 3.4.2 in www folder.
While installation it gives no error, smooth installation but when i login to my dashboard, my display was not good.
The left side menu of dashboard is totally invisible/out of screen space.
even i tried to minimize columns from screen options, it display nothing.

Please help me get over this.

Thnx in advance.