Uploading problem - need a help

Hi everyone,
I have a big problem to upload zip files - Win 7 & Chrome + Firefox
I use FTP but I can’t see my files in upload page. I tried the button but only JPG files can be uploaded.
I had a success using Safari but the upload page in Safari looks like a very tall and very thin box.
About Chrome - upload button is not active at all.
I allowed Flash and cleaned cache - any other help except these.