~ready to rip out her own hair in frustration~

ok, this is a computer-problem post. a plea for help from my tech-savvy friends. a goddamn HISSYFIT thrown because my computer won't do what i tell it to and i don't know why. so, yes. if you're neither tech-literate nor interested in hearing me shriek obscenities at my currently-obdurate-but-usually-obedient little iMac, i'd advise you to scroll on down.

i can't decompress files labelled .torrent.zip or .zip.zip and i don't understand what the difference is between that and a file labelled just plain .zip . I have StuffIt expander - can anyone recommend something that might work better, or suggest something (ANYTHING) that might help me get my askjhgdfj computer to work with me here? or maybe this is a PC-vs-Macs thing... stupid PCs ruining my life... why isn't everything mac-compatible?

~goes off to sit in a corner and cry~