You can safely deleted the java 7. You don't need it, and it could potentially cause issues having both versions (but it shouldnt and probably wont).
Try updating your visual c++ library to fix the zezenia issue.
http://www.microsoft.com/en-us/downl....aspx?id=14632
Something else you could try, because the file could be getting corrupted on download, is that you could do the following.
1) restart your pc
2)download jonbot with another browser other than the one you were using. Corrupt jarfile is caused by 2 things, a bad download, or a bad metaINF file in the jarfile. The jarfile runs for my testers, but not for you, leaving me to believe that your download is corrupting the file somehow. Perhaps a download manager/accelerator or something.