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There are a lot of problems that plague many remote desktop sharing applications including the fact that several can be pretty tricky to install and use.
This is not the case with TeamViewer.
Even the full version of TeamViewer does not require installation on your system. You will still have to download a small file so that the software can detect your IP address and assign you a random password for the session. However, once you have downloaded this file, you have the option of installing the software from your machine or running the program without an installation. You may receive a pop-up warning from your firewall software when you try to run TeamViewer, but if you choose to unblock the application, it should work just fine.

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I had the full version of the software downloaded and installed in less than a minute with my cable connection.
It may take you a little longer, depending on the speed of your internet connection.
You will need the full version if you plan to be the party that establishes the initial connection.
If you only need to be able to accept incoming requests, you can access the Quick Support version, which requires no installation.