You could try my favourite. It is boilsoft MOV converter. You can get this from the official website or from the link that i have given you below. This software is not for free for it will require a code. I downloaded a crack from the mucaca cracks. The website for the CRACK is written down there. You just click download crack.
After this, you download the trial version, install it on your computer, and make sure it runs. leave the programme when it asks for the registration key. Just close that box. when you know the programme is running perfectly, close it. After you close it, go to the folder in which all the data of the file is stored(it might be in programme files if you did not change where it would be installed). When you thenfinally get there, copy the crack file and paste it into this folder with the other items. The computer will ask you whether or not you want to overwrite. This is where you say yes. After it is finished, just start the programme again and you will notice it does not require a code.
Then the steps are easy. You just put the file/s that you want to convert and then just press convert.
However this programme only converts from 3GP to AVI, MPEG, DVD and WMV. If you want to know how to convert the other way around, read on and get bored.
If you want to convert to 3GP, you have to download a file called ImTOO 3GP Converter. The address to this file is given below. This file is also a trial version but in this case you will not need a crack even though you can get one. Once you install this file onto your computer and you have started it, you will be asked to register. The registration code is
Name: serials.ws ; serial number: GEARZEROGEARZEROGEARC949-B91E-00EB-94C2
(you do not copy this thing exactly as I put it. you copy the name into the name section and the serial number in the serial number section.) After you do this it should say that the registration is successful. If it does not you can search for the code on the net(Becareful!Many sites are very sick).
If you want to convert the movies onto a nokia series 60 or 80 phone, then i suggest you use smartmovie. Smartmovie converter converts almost any video file down to a tiny size without it changing its quality. The url to get it is written underneath. The procedure to register without buying is abit long. All you have to do is install the codec file which is in the Series60\Codec folder. This should be your first step because then you wont be able to play the videos on your mobile. Then install the file in the folder behind this called SmartMovie_S60_lcg. Finish this and then leave the mobile alone for now. The next step is to go into the converter folder and install the converter on your computer. After this is done you open the smartmovie file on the mobile. If you go down a few steps you will see an option where you can unlock the file. Go on it and it will give you a number and underneath that number you will need to write the code. Forget writing the code. Open the black iconed file in the beginning of the folder on the computer. This is a keygenerator. Write the top number given in the mobile on the mobile into the area where it says Owner's Name on the black file on the computer(i am sorry if this is confusing). Then press generate and a number will appear on the bottom hand side of the keygenerator. Copy this number onto the mobile. This number is the code that will unlock smartmovie. After you unlock smartmovie then you will be given an option to unlock the converter. Do the same process but in this case you will need to copy the number from the converter onto the mobile which will give another number which you copy onto the converter(In this case the mobile acts as a keygenerator.) You will not need the black iconed file any more.
After the unlocking is done you just:
CONVERT the files
UPLOAD the files onto your mobile
PLAY the files on your mobile
I hope you liked my answer and you will choose it as best choice. If not, this was a big waste of time!:)