In sony erricsson w20 mobile,through laptop i put some videos but not working in my mobile.what should i do?

No is Not a Hardware Problem.
Just Upgrade your Firmware using Sony Erricsson Update Service for easy ways.
just download and install Sony Erricsson Update Service,Connect your phone to Computer using data cable,and Sony Erricsson Update Service will found and upgrade your phone firmware automaticly.
you can try download Sony Erricsson Update Service from HERE.
and you can found The Tutorial for using Sony Erricsson Update service in HERE

my camera is not working model no sony e w20 mobil ask press to 0 help telme can i do

To unlock the Sony ericsson W20 You can use the unlock code,You can get the unlock code and instructions from here
Theunlockspot.com
and Unlock it from Network lock,You can enter the code using the instructions below:

Sony Ericsson W20 Unlocking InstructionsWarning : Do not enter any wrong unlock codes on your Sony Ericsson W20 mobile phones. If you enter over a certain amount of wrong unlock codes on your Sony Ericsson W20 mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch ON your Sony Ericsson W20 without any SIM Card,
2 - Press the left arrow key/button once,
3 - Press the button * twice,
4 - Press the left arrow key/button once,
5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you want to unlock)
6 - Enter the Unlock Code.

You definitely have a Video Card Error related.

1. Find Where Your Graphic Card located (asuming your computer has a separate card for video .
   
2. Check the connection from your display to your video card (these connections are very thin wires running all the way to the video card or the MB).
   
3. If the second step is clarified then have your graphic card checked. or have *********** Board chip set checked for bios and fermware.

Mostly you have a connection problem.

first get the settings for your cell phone from the service providor and then for soft wares you can visit wap.getjar.com

No I do not think that model has an external video connection.

day befoer i found a site where i found mobile unlock assistance as well code reach for more assiostance http://www.unlocking4u.com/

on the sony erricsson website. first look up the fone > support > downloads

You need to take the phone to a mobile store and have them unlock it for you or you can try online www.mobile2mobile.net or www.unlockitnow.com , remember unlocking is not a free service.

No worries, you can recover deleted files from mobile phone with mobile data recovery program, take a look at this one:
how to recover data from mobile phone

hope this helps.