Ever since installing a new modem, the computer exhibits some really strange behaviour. Without any user intervention the computer turns itself on, however if the modem is disconnected from the computer it will not turn itself on. When the computer turns itself on, and I attempt to establish an internet connection, a message appears stating that the modem is in use, however the phone line is clear. If I restart the computer I can establish an internet connection without a problem. Once on the internet, web pages load very slowly and occasionally Internet Explorer cannot even access these web pages and returns a message ‘Site not available’. However, if I try to access the site immediately again the problem does not occur. The computer is running Windows XP with ZoneAlarm firewall.