Neither FireFox nor Netscape are a product of Microsoft, are allowed to run
on WinXP, as if MS had its choice and it wouldn't cause legal issues,
neither would be allowed to run on any windows product as they both are in
direct competition with Internet Explorer, which is a MS product. Suggest
you go to the FireFox support site or a FireFox support newsgroup. My first
guess would be though you don't have the proper FireFox configuration to
allow it to use a scrolling mouse wheel. Note: My scroll wheel works just
fine in my version of FireFox, although the OS on the machine where FireFox
is loaded in Fedora Core 4 (Linux), not Windows.
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