This is a long story but I will make it short. I have had this printer for 3 years and the drivers and support have been nothing but headaches and time sinks. If you search on the net you will see countless problems in this regard.
The latest release by HP that was advertised to fix all the issues was Version 3.10 released in 2003. Subsequently a patch was released for XP: 'hpcmpmgrFix.exe' 2004-07-28 Version: 2.1.5
This printer was advertised as a networkable printer yet all the issues arise when it is networked. HP Support doesn't help - they try and con you into thinking their software works but it doesn't.
I have agonized with these issues on several computers and even on fresh installs of Windows XP all with similar results. I have a good background in printing and networks and understand how a printer needs to be installed. Yes, anti-spyware and anti-virus were off during installation.
Once you install from the CD your problems begin. The software crashes and doesn't print. You would think HP would at least get this much right. I worked around this by deletiing and reinstalling the TCP/IP port. Then it will print. However, it will not scan - TWAIN errors. I traced the problem file down to 'hposts07.exe' - this file causes miscommunication and crashes on XP.
In the past with the older drivers I was able to scan, however the older drivers would act up frequently and peg CPU usage at 100% - particularly on Win 2000 - even when no printing or scanning was initiated.
My question is, has anyone found a way to get this printer to scan on a network? If so, how did you get it to work? To scan, I typically would do a File > Import in Photoshop. HP places two files in the Windows\Twain_32 folder for scanning.