1) No idea why school Wifi causes issues.
2) You should use the Free 'Open Explorer' program to transfer files.
3) ARe you on Mac or PC. Check out the thread titled 'Top HD and HD+ Issues' in this forum. It has some suggestions for being able to see the folders. But it's very hit and miss.
Was there ever a resolution to your wifi problem? What school? just curious about the wifi configuration.