how to connect to a remote computer

Hi :)

There's a few things here. Try going up to the top taskbar and click on

System - Administration - Synaptic Package Manager

it asks for your normal user password, not your SuperUser/Root one. All packages that are currently installed and available for you to use are marked by a green splodge. Either search tool is good but i prefer the "Search" button because it looks through package descriptions as well as titles so it lets me be a lot more vague. Try looking up "vnc" or perhaps "tunnel" (and "wesnoth"). To install something new right-click and choose "install". When you have selected everything you want to try out then click on "Apply".

Also to look up equivalent software that you know the name of in Windows
https://help.ubuntu.com/community/SwitchingToUbuntu/FromWindows
but linux offers a lot of stuff the Windows doesn't have. If you are in competition with a Windows user for which is better; linux or Windows then it's probably better to just leave it and let him get on with his thing because he will probably be using linux soon enough anyway. However, there is always this
https://help.ubuntu.com/community/Antivirus
http://librenix.com/?inode=21

Given all the security issues in the Windows world your friend has probably already made sure that the security on his machine is ultra-tight because he will be expecting you to try to grab control of it and so his security might be focussed on stopping you. The best answer isn't to chase what he's already done but to get ahead at something else ;) Sounds like a good fun game :))

Oh and at the beginning of your message you kindly say "Hi ubuntu team" which sounds as though you haven't yet realised that you have already joined "the ubuntu team" yourself :) Welcome in to the wonderful world of linux :))

Good luck and regards from
Tom :)