device manager keeps refreshing

Hi group,
Lately I've been having problems keeping my internet DSL connected, tech
support suggested updating drivers in device manager, havent been in there
in quite a while, when I opened DM it continously refreshes after 2-3
seconds. Don't know how long its been doing this. I went into safe mode and
it does the same thing in there.
Running windowsXP SP2
Any suggestions.
Many thanks in advance