Hi,
You need drivers for your system.
All the official acer drivers for your system are here :-
http://support.acer-euro.com/drivers/desktop/power_s260.html#driverAs listed at the site:-
Realtek Audio Driver is your Multimedia Audio Controller.
NVIDIA VGA Driver should be your Video Controller, if that don't work try SIS VGA Driver.
SiS 661 chipset driver should fix your usb problem, if it dosn't update windows to SP2.
Get that from here:
http://windowsupdate.microsoft.com/. Then try again with SiS 661 Chipset Driver.
You should also install the rest of the drivers for your aspire sa80.
You said you had no access to internet so burn the drivers using a friends computer (one with internet) and install from the disc and you should be fine.