1/ Click the windows sign (formerly known as start), go to control panel on right handside, look for programs and features and double click, click on any program you wish and there is buttons at the top saying uninstall/change/repair.
2/ No. I have a 80Gb laptop hdd and only get 62Gb on it.
3/ Is it an acer laptop? If so, press the (e) button on the laptop itself and look for E-Recovery then you will get the same message up.