SUPER is a free conversion program available from ErightSoft Software. The results obtained from using it are notoriously poor, and so I don't recommend it on that basis alone, but there is another problem with SUPER. It has a piece of malware/spyware attached to the installation program called OpenCandy.
This is Microsoft's description of OpenCandy:
[I]Adware:Win32/OpenCandy is an adware program that may be bundled with certain third-party software installation programs. Some versions of this program may send user-specific information, including a unique machine code, operating system information, locale (country), and certain other information to a remote server without obtaining adequate user consent. These versions are detected by Microsoftâ€™s anti-malware products.
[/I]Blocking installation of this malware during installation stops the entire installation process. My advice is not to use this program.
There are a lot of free alternatives that work better and have no suspicious addons. WinFF, Handbrake, AVStoDVD, Ripbot264...this list could go on for a while, depending on what type of conversion you need.