HP Photosmart 8250 noncompatible with Windows Vista program

I purchased a new Dell Computer in 2/08 with Windows Vista installed. When I put my old disk that came with the HP printer and tried to download it, the computer stated that it was incompatible with Vista. I downloaded another program that worked for awhile, then when I logged on, it wouldn't print - showed stuck on organizing photos. When my husband logged on his desktop, it worked ok. I chatted with an HP tech, who had me uninstall the program and install Essential 3.0. Now it won't print on either of our log-ins. Also, since I installed the new program for HP photosmart a few months ago, my Dell computer would turn off and reboot, showing an error and crash dump. I've worked with Dell tech's for "hours" and after yesterdays session, with the Photosmart disconnected, and many adjustments, the problem went away. When I reconnected the HP photosmart, the problem came back. Dell said I needed drivers and software compatible with Windows Vista. I've uninstalled everything beginning with HP on the control panel programs, and computer is still shutting down and rebooting. Before I call Dell tech support again, I wanted to see if I could get the correct drivers and program installed. Can you help? I'm trying to be patient, but I've spent many hours on the phone with Dell and chatting with the HP tech. Thank you