Hi loveguru19,
Welcome to the HP Community! I will be happy to help with the Windows 7 issue but I will need some additional information. What is your product number? There are several different models in the Pavilion M6 series. What did you reinstall the OS? Did you have a crash or another problem?
Find your product number on a notebook:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c00033108
Thank you,