What operating system does that laptop have?
Windows ? - xp, vista, win7?

you should be able to find the wireless connection info in the control panel section.
but if the connection keeps dropping for some reason it may be timing out somehow....

I don't know if you have a little icon showing when the wifi signal is on or off, or if you are possibly getting timed out on websites??

If you can't find the user guide go to the Acer website and look in the support section.
You can get updated drivers & other things on most manufactures sites.
you can register your product & sign up for email notices & offers etc.