Printer problems in all Small Business Office 2003

[ferdy]

This is probably rather mundane for most of you clued up people, but I am desperate to try to get some help with this problem: no one on the Microsoft discusions forums seems to believe me, are sceptical or rather dismissive, and HP customer services say it is not their problem & contact MS. In the MS discussion forums, however, I have seen recently several instances of other correspondents, users of all Ofice programs & XP referring to this same problem with other makes of printer - Epson, Lexmark. I run a small secretarial business, and this problem is seriously damaging my reputation with my clients.
My set up is - I have Small Business Edition Office 2003 SP2 XP on a recently constructed bespoke computer, which is fantastic in all respects. Bags of memory etc. I also have a HP officejet 5510 office jet printer. In addition I have an old HP 810C, which has done faithful service for me for nearly 5 years connected to my previous computer which ran on Windows 98 with Office 2000. Everything was printed perfectly using the 810C and the old computer, but my business outgrew them and I purchased the new compuer and printer. My problem is that when I try to print from my new printer, the colours are dull, muddy and just no WYSIWYG. Cartridges, self test, latest printer drivers, monitor etc - the whole shooting match is bob onn but when I try to print what looks exactly as my client wants when I show them the final proof document on the TFT, it comes out looking awful. I have have run a test using my old printer on the new set up and the result is the same. I have been told by my computer supplier & HP that this is a bug and that MS is supposed to be fixing it. The supplier told me that they have a client who runs a printing business who had this problem so badly that he had to revert to 2000. Does anyone out there have any suggestions or even have they heard of this? Any help gratefully received.