Hi bytch. Firstly if your photos are in jpg format there is no point in zipping them. jpg is already a compressed format, and zipping them often increases the size slightly.
If the zipped files are corrupted I don't think there is much you can do about it, but hopefully someone on this forum will prove me wrong.
What method of file copying are you using to get them back to your pc and what software did you use to zip them, and what are you using to unzip the files?