As stated before, you'd need to know how much traffic their website received to get a better idea of what their actual requirements are (VPS or dedicated for instance).
As for the OS, it seems that Windows is definitely necessary due to the ASP requirement. I don't think Linux servers can run ASP pages at the moment and as for PHP pages, both Linux & Windows can run it. So if your friend had a site coded in PHP, it should work on a Windows server as well.
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