download win.rar and install it. after it is installed, right click on a zipped file and click on 'extract items' to get the files out of the zipped file.
clicking 'extract here' will unload all the files into the current window, clicking 'extract files to' opens a window to choose the location the files are sent to after extracting them. presuming you are unpacking CS packs, i would recommend sending them to a different folder, just in case the pack has lots of files in it, its easier to manage that way