BleepingComputer.com: Dc King

i have been dc very often, i try to reformat my com last night and i still having this dc problem
i try virus scan reinstall my singnet mio boardband and still the same,
i share same connection with my bro com both using ethernet cable but my bro won't have dc problem
as we playing the same online game( best record: 2dc in 15min while my bro still online )

Before i got dc, my internet explorer will auto close whenever i open explorer
after i got dc, my connection will get back again and the dc still occur at least 2-5time per day

i using window xp, singnet mio broadband, internet explorer 6, ad-adware 2007,

my com spec: intel core 2duo 2.2ghz(e4500)with gigabyte mainboard p35-ds3
2gb ddr II pc 667 kingston ram, 250gb sata II hdd wd, geforece 8600gt asustek 256ddr II pci xpress card

could it be hardware problem?