$unny, what do you plan to do with it? For editing photo's or for drawing and that?
Very doubtful you need photoshop, there are alternatives.
Winzip is a programme for compressing a number of files into one, for transfer round the web etc.
I think Windows can deal with zip files now, but if you need it, it's free. You will probably come across a zip file sooner or later.
You can get it
HERE