Could be one of many things.
A loose connection somewhere, maybe even a power supply issue.
When playing your Xbox, do you have your pc on at the same time?
are your computers connection settings ok?
Have you spoken to your isp about the issue?
Your profile says you have xp sp2, has this been updated to sp3?
According to one report, there is an issue in sp3 that seems similar to your problem.
check this link
http://apcmag.com/router_crashes_blamed_on_windows_xp_sp3.htm
A loose connection somewhere, maybe even a power supply issue.
When playing your Xbox, do you have your pc on at the same time?
are your computers connection settings ok?
Have you spoken to your isp about the issue?
Your profile says you have xp sp2, has this been updated to sp3?
According to one report, there is an issue in sp3 that seems similar to your problem.
check this link
http://apcmag.com/router_crashes_blamed_on_windows_xp_sp3.htm
