Call your school IT staff and see if they are blocking P2P softwares.
I am running Win XP Home SP2, 3.0 GHz P4, 1 GB DDR Ram. Running on schools ethernet. Out of the blue, my ARES galaxy filters software searches. My roommate is still allowed to do them. I went through all the filter files in the ares program folder and even uninstalled, then reinstalled it. I used to be able to DL through it. I'm guessing it is a registry entry or DLL file planted somewhere that won't allow this, but does anyone know how to get rid of this?