Ubuntu not working

[Derek Smith]

Hi,
because we are unable to have ADSL we have to use Wireless Broadband.
I am with 'Three'
Problem - I can access the Internet easily  with 8.10 but Skype and my 
printer (HP C5380)does not work with this OS.
9.04 will not work at all at 9.10 works some of the time but mostly have 
to completely re-install connection when I log in.
9.04 & 9.10 have been installed with various discs both 32 bit & 64 bit 
versions as well as upgrade through update manager.
Whilst 9.04 worked perfectly for 12 months, the problems started when I 
received 2 x Trojan Horses and Tracing cookies, designed to stop 
Firefox. These cookies were passed onto a Laptop running 9.04 and Vista, 
through 'Three' Wireless, and these cookies (3 infections) destroyed 
Firefox in Ubuntu but Firefox in Vista was okay. The infection was 
healed but 9.04 no longer works on this computer and 9.10 only occasionally.
A third computer running XP only had over 20 infections of the Cookie 
which caused the computer to freeze-up. Once infections were cleared, 
Internet connection (Bigpond Wireless) resumed to normal.
I have had the Software on the Three modem updated under warranty but to 
no effect.
I am surprised that all my calls for help in this matter fall on deaf 
ears. Either all the experts have no idea or they do not believe what 
has happened. I may not be an expert but I do know more than about 90% 
computer using community.
I do suspect that there has been a change in the 'Three' software which 
affects  the connection. As they only support Microsoft they are not 
interested  in the problem.
I would appreciate any assistance in this matter.

Derek Smith