HP PHOTOSMART ALL IN ONE PRINTER C4500

I have the above printer. I was using OS 10.6 snow leopard and everything was great. I have Microsoft Office 2008 for Mac installed. Everytime I use it it takes my printer off line also everytime I use another computer it takes printer off line and I have to restart my Macbook Pro. It will print then until I use the Office program or another computer. I would even purchase another wireless printer for the M. Pro but afraid that I will have problems with it. Can ANYONE HELP. I have went through PAM and still have the same problems. Upgrades are up todate. Printer driver is in Apple support uninstalled twice and reinstalled and used HP web site which sends me to Apple for driver which I have down loaded and printer is listed.