Actiontec

I have a second hand Actiontec Wireless Cable/DSL router and USB adapter.
The router is connected wired to the first XP computer and the Adaptor
wirelessly to the second 98SE computer. Both connect to the Internet (which
is all I require then for) . The computer with the adapter works fine until
I want to switch it off as it hangs at the screen with windows showing
"turning off your computer". I then switch it off at the mains. Thisn
happens 95% of the time and I wonder if anybody might have a suggestion as
to a fix!
This did not happen prior to me installing the adaptor and dosen't happen
when I uninstall the adaptor.

Bob