PCTech Forums

First go to Acer’s web site and download . Just in case you need it

Then, remove every instance of that modem...the hardware in Device manager (start . control panel > hardware tab),
the drivers, any add-on software that came with it, etc.
Reboot the computer and let Windows re-detect it, reinstall software as needed, test it.

If that doesn't help try disabling the modem, rebooting then enabling the modem again, test it.

If that doesn’t work then please download , unzip it to it's own folder.
Start HijackThis and select 'Do a system scan and save a logfile'
Now post the contents of the logfile back into this thread