The garage door remotes I have, aren't working properly when one remote is programmed it disables the other, and also the outside keypad isn't working either.

I bought a new keypad and 2 VISOR remote (30498). As to programming garage door opener, I did like here:
programming garage door opener
- it tooks me 20 minutes and works great

I have to assume a couple things here. First - I assume he still has a remote. Second - You want to change the opener so that his remote will not work and not just the keypad outside the garage. So.

To change the opener so that none of the existing remotes and the keypad will work just locate the smart/learn button on the rear of the motor unit near where all those white wires go. You may have to remove a light lens to get to it. Press and hold this button for 6 seconds. That erases the memory. Now you need to program your remotes. Hold the button down on the remote and then press and immediately release the smart/learn button. Do this for each remote you have.

Now the keypad. Press and immediately release the smart/learn button. Walk over to the keypad and key in any 4 digit code you want and press enter.

That's it.

Either you have the wrong keypad for your opener or it has reverted to another technology. Whichever you need to get the model number off the opener and get another keypad. The model number is on the opposite end of where all those white wires go. If it is a Craftsman it will start with 139.

Sounds like your outside remote may be the wrong one for your opener. Program your original remotes and you will most likely find your outside remote will not work. The model number for your opener is on the opposite end of where all those white wires go. Use it whenever you need to buy anything for your opener.

You are going to have to do a process of elimination. I think you have either a bad remote or a bad keypad. Try programming a remote and then the keypad. If only one works then go with the other remote and the keypad. If only one works then program the two remotes. If the two remotes work then the keypad is bad or if you can program one remote and the keypad then the other remote is bad. Get rid of the bad one.

You can't. You need to find which remote works with the keypad and discard the other one after removing the battery. Then you will need to purchase a new remote making sure you get the same model number as you already have. One of your remotes has reverted to an earlier technology and replacement is the only cure. The explanation of this problem is the manufacturers not mine.

The odds are the keypad will not work with your new opener. The radio frequency has been changed on the new openers. But if you want to try you just press and immediately release the smart/learn button on the motor unit and then walk over to the keypad and key in your 4 digit code and press enter. These instructions are for a wireless keypad.

You have a remote or keypad that has reverted to an earlier technology. You need to eliminate the bad unit and the others will program. Sears is made by Chamberlain which also makes Liftmaster and several privately branded openers.

Either your keypad has reverted to an earlier technology and will no longer work properly with your opener or you have the wrong keypad. Either way take the model number off the main unit and get the correct keypad.

Your keypad is not the same "generation" as your remotes. You operator will work with your security plus remotes or your old keypad but not both. Yor cheapest solution is to replace your keypad.