Hey farhanchd,
What is the full name of your HP Laserjet printer?
There are several models in the HP Laserjet 1100 series and would need to know the exact name to give you precise instructions.
I do know that the Laserjet 1160 has a driver available through the Windows Update system and may be the same for your printer. Please take a look at the information in the link provided below.
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?&objectID=c02536257
Hope this helps,
Jason