Are u using ADSL/Cable?
An ethernet modem or USB modem.
A router? (ethernet or USB)
I would run the LAN connection wizrard and discoinnect ur router for a few minutes (unpower it)
or try to reset ur modem.
It could also be a virus or spyware/ check for them with programs like norton, ad-aware, spysweeper
TheMajorMMX - Intel P200 MMX @ 225Mhz - V-Tech (PcPartner) Baby-AT mb w/ Intel Triton TX chipset - Nvidia Riva TNT2 M64 w/ 16MB - 256MB M-Tec SDRAM - Still running.....