well they *can* help (and should) but only if you have enough repair parts. Make sure all the .rar files and the .par2 files are in the same folder on your computer. Then before you click on any of the .rar files, double click the first .par2 file. WINrar should run automatically and scan for missing and broken files in the archive. At the end it will scan you .par2s and tell you whether or not you have enough parts to repair the .rars. Be sure the box next to 'repair automatically' is checked. The just let the program chug away. When its done it will either tell you that you need more parts OR that the 'repair not needed' or 'repair complete in..."

Hope this helps