Where can I find software for my H/P T45 office jet printer, copier, scanner, fax. ronmohr1937@sbcglobal.net.?

Having trouble because current software NOT digitally signed and windows xp doesn't like it. The H/P software wont let computer hibernate. also I have tried to uninstall software and reload but Windows warns me not to procede. Has anybody else faced this. The disc that came with the printer wouldn't load and when I contacted H/P they said to download from internet which I did several years ago and have been living with intermittent problems which have now become worse. Should I just giev up and but a new printer / fax etc.??? Thank You, Ron Mohr