If you have to dial odds are you arent that much at risk as any serious threat would take to long to propogate. As for "him wanting to destroy your computer" that might be a bit far but just get a firewall, Agnitum has a good free one (unlike ZoneAlarm which is just freewhen I dial to internet,there always have people scan my computer.i know he want to destroy my compuer.but I don't know how to prevent he.
my computer is not good and I don't dare to said it.
Intel celeron 2.4GHZ
HY DDR330 256M SDRAM
REALTEK AC97 sound card
NVIDIA Gefoce4 MX 440 64M
Samsung 80G HDD driver
LG 710S 17
LG 52X R-ONLY
i know my computer is very bad.