My daughter's ISP shut down her account a few years ago when it was hacked and was forwarding spam. She had 2 teenagers at home at the time. I don't remember what version of MS they were running. She bought a 20" iMac last year and is very happy not having to deal with the crashes the MS machine suffered. The Mac runs behind a Linksys router as does mine...
Sorry your daughter had a problem, but more ISPs should do the same.