I used wicks to make the card bootable and loaded CHDK following instructinos. But it does not work.
Welcome to the world of CHDK. Sorry you are having problems. Please provide us with a lot more information if we are to help you. Things like :
1) Camera model and firmware version.
2) Exact filename of the CHDK software you tried to install.
3) Exact steps you took to install CHDK.
4) Exactly what happens next? What doesn't work? Does it boot? Do you see the splash screen? Can you go to <ALT> mode and get into the menus?
Than I tried with stick, but stick does not see the card at all !? Now even wicks does not see it any more . . .
It is 4 GB microSD , Windows 7
There are many ways to install CHDK. Stick and Wicks are great apps but they are written in Java and sometimes people have trouble with them. You could read through this page and try some of the other installation methods listed there : http://chdk.wikia.com/wiki/Prepare_your_SD_card
Also, did you try rebooting and then running STICK ?