If you have to move around between computers, are using a college or work computer and have no admin rights and want to use a VPN to get around internet filtering you will find that OpenVPN needs administrator rights to be installed. There is a work around for this, simply use a portable VPN on a USB drive, which combined with a portable internet browser will also stop traces being left in the host computer.
You can bypass your workplace and library internet filtering with a virtual private network, as long as you can install a USB thumbdrive you will be able to launch the portable VPN or SSH tunnel, that will get around any logging, not even visited sites will be seen by the admin.
Portable VPN applications
OpenVPN portable (Free): OpenVpnPortable is openvpn and a modification of openvpn-gui as a portable app, so you can connect to your vpn on any computer. It is open source and free, for this portable VPN to work you will need to have your VPN provider digital certificates.
PortableVPN ($/€): This application allows to establish a VPN connection while using a computer without admin rights. You do not need to configure anything other that the portable VPN, it also allows for a portable PPTP. This application is also U3 capable for USB thumbdrives with U3.
Portable SSH tunnel
KiTTY: KiTTY is a fork of the well known SSH client PuTTY, KiTTY does not require any installation and you can use it easy with and SSH provider or your own SSH proxy server, place the portable SSH client on your thumbdrive and configure your browser to do all the surfing through the anonymous tunnel.
VPN services offering Portable VPN
VPNReactor: VPNReactor Portable can be run from a USB thumbdrive on any Windows computer, the application is free but you will need a subscription to this US based VPN service to be able to connect to their servers. A good solution for people travelling to a country that censors the Internet, just remember that it is also necessary to change the ISP DNS servers to bypass the Chinese Internet filter and this will not be possible unless you have computer administrator rights.
Torguard: VPN service providing a portable OpenVPN application in addition to their desktop OpenVPN, they have servers in Russia and the Nerherlands that can be used to anonymously download torrents and keep no logs of user activities, the company claims to erase connection logs on a daily bases.