Dear Enrico737,
Before jumping down someone's throat you might like to understand the nature of supporting something such as 10yr old software under a modern OS like Win7.
Firstly, the OP hasn't specified what OS the original software was designed to run under, and in order to aid the OP that is a pretty significant detail to omit, as different OSs provided the underlying software support framework in different ways, and there are specific tricks to each.
Secondly, the nudge about .Net is because some people forget things like this and sometimes the software writers of low-volume stuff like this don't necessarily provide the customer with a helping hand, and YES it is important both to have settings for win95 (or whatever) AND to have any pre-requisites installed.
Finally, the range of knowledge on a forum like this means that a first message has to encompass all abilities such that a rapport can be built up between helper and helpee.
So, wind your neck in, THINK about what you're saying to other people on an Internet forum, and understand that nobody here gets paid for any of this advice and assistance.