VMD, Swiss pdb viewer, and RasMol are some of the tools you should try.

You can use gromacs.

Autodock and autodock-tools (free softwares) may be useful for interaction prediction;

http://autodock.scripps.edu/downloads

you can use VMD, RasMol, Hex, for such kind of study

If you want predict a structure you can try FOLDX and FOLD IT. A study of sequences by protein blast can help you find some function of your proteins, nevertheless you have to be online.

Swiss PDB Viewer, Rasmol, VMD, Pymol, Discovery Studio Visualizer, Modeller, Hex, Flex, Autodock, for Blast, you can use offline (standalone) BLAST downloadable from the site of NCBI, there many more depending on the type of study you are going to perform....

try Funcoup and cytoscope. they allow functioanl interactions and predictions and are free.thanks

Can give me link to download dicovery studio crack or full version

Try TPP (Transproteimics Pipeline) It's freely available. Good Luck