Here are some links to important software for any Windows based computer; these are direct links to the downloads themselves, so you will not be redirected to other websites when you click on the links below.
Mozilla Firefox - a web browser that is safer and less of a resource hog than Internet Explorer.
Open Office - a free version of Microsoft Office that allows you to open or save Office documents.
Java - Java allows you to play online games, chat with people around the world, etc.
CCleaner - CCleaner is a freeware system optimization, privacy and cleaning tool. It removes unused files from your system, allowing Windows to run more efficiently.
TeamViewer - With TeamViewer you can remotely control any computer as if you were sitting right in front of it - even through firewalls. All your partner has to do is start a small application, which does not even require installation or administrative rights.
µTorrent - µTorrent is the world's most popular BitTorrent client. Most of the features present in other BitTorrent clients are present in µTorrent.