Heroes 3 issues under XP or Vista.

Try buying a licensed disc, and also remove all accelerators/optimizers and other programs that your well-meaning friends might have installed on your computer. If that doesn't help, install the operating system that was present when you purchased the computer. The effectiveness of this advice is 99%. The only problem for Heroes is integrated graphics cards. A relatively common sound on board system at the time, as well as other integrated systems, can negatively affect performance. For example, an integrated graphics card can be the cause of the fifth installment of the game not working. As for the connection, that's a completely different topic...