I have a jensen jr 3000 universal remote contron and i have lost the operating instructions.i am trying to find a web site to get them from thanks ken

Read the list of codes on the remote control web site.

I would go to manufacturer''s web site .Codes should be obtainable there

Try http://remotefinder.rca.com/default.aspx?site=jensen to get the code for the device.
I also found this manual. It's for the 321, but the process will probably be similar.
http://safemanuals.com/user-guide-instructions-owner-manual/JENSEN/JER-321-_E

go to www.jensen.com and download the codes is free.

Here is a link to a site that has the instructions and codes for a jr 300 which works the same as a JR400. How do I know? I had the same problem as you and this is how I solved it. Good luck!
http://www.remotecentral.com/features/r-jr300.htm

Follow this link for the codes:

http://www.remotecodelist.com/remotes/Jensen300Series.pdf

Try these set of instructions:

http://www.remotecodelist.com/remotes/jensen/JR300C.pdf

get it from www.jensen.com is free.

I'm not sure if your remote will operate the vizio TV. You can try a code search and see if that works because the vizio TV is not listed.
Here is the user's manual.

Click on the user guide to download it.