C drive formatting issue in XPS model

Hi,

I have formatted my laptop C drive through the Windows 7 DVD provided by dell.I have formatted C drive only because I don't want to lose my data in other drive on my laptop.

But now theme has been changed to as given below:

Image 1:

earlier it was displaying as given below:

Image 2:

I have tried to change the theme by Right click on desktop --> Personlize --> Windows 7 Basic to Aero theme Windows 7 but couldn't succeed.

Once I tried to restored Factory settings instead of formatting C drive only that time I got theme as in Image 2 which was OK for me.

So my concern is Do I have to install any other software to correct this issue.