What did the frontpage say?
Did the URL change? Like from www.yourwebsite.com to
www.someoneelse.com
If you answer yes to the second question, I can't help. It's the
problem with your webhost. They are probably using a shared IP
address, which resulted in disaster.
If the frontpage showed another thing other than the usual one, my
condolences to you. Your company's been hacked. Please contact your
webhost as well as the system administrator in-charge of reading
server logs to find out what happened.
Whoever that is in-charge, please also ask them to go and update
everything to prevent a re-occurrence. And for God's sake, change
the default settings.
