Printer driver problem

Hi, we have three pcs that share a printer via a local shared connection. Two of the PCs were replaced with brand new ones that have Windows Vista Home Premium.
Our prior HP printer driver worked well, but not that the new PCs are up, running, and have a new printer driver connected, the printing is terribly slow, and it doesn't print in color even though the printer is a color printer.
How do I locate the printer driver and/or made modifications to it?

Thanks.

Oh.. forgot to include printer details - it is a HP Business Inkjet 2300

Hello Kjohn,

The drivers for the HP printers you can find at this link, however I can't promise whether you find the 64bit one or not. There are three types of Business Inkjet 2300 printers to choose from. Hope it helps.

Cheers...