Problem with printer {hp laser jet p2015}

Recently i have installed Hp Laser Jet P2015 Printer to my System (OS:Windows Vista-2007, System:Dell, Processor: Intel Premium, Memory: 2Gp, Type:32-bit operating system) . It is working perfectly with Word and other formats except Excel. While i am selecting Portrait Orientation it is showing in Print Preview the same but while printing with Landscape orientation some for Landscape showing perfectly but printing with portrait and it is another problem is printing with "DIFFERENT FONT" and Style, but in the print preview it is showing same font what i done on the excel file while printing time it is different and i am not able to change this. I have Re-Installed several times and made the troubleshoot with Hp website i couldn't find any solution.

Please help me!!!