The first thing you should try is downloading and installing the latest full software solution from HP:
http://h20566.www2.hp.com/hpsc/swd/public/readIndex?sp4ts.oid=5096249&swLangOid=8&swEnvOid=228
If that doesnt work then you are going to be out of luck. MS is no longer providing updates to WinXP which would normally be the next step for scan drivers when HP does not provide them.
