Visual Basic 6 progam

We have developed a visual basic program which uses MS Word and MS Outlook to produce certain documents and set tasks, send emails etc. However, on certain operating systems and certain versions of Office it does not work, e.g. Windows Millenium, 2000 etc. We need someone who can advise us on how to solve these issues on an ongoing basis so you would need to have extensive knowledge on VB6 and installing it on different operating systems. We can work out payment on a per job basis or something like that. Please don't bid on this project unless you have extensive knowledge.