Symtorrent... Could this be the problem?
"October 8, 2007 - Imre
The previous certificate, which we used to sign SymTorrent, has expired. This caused that you were not able to install the prebuilt (SIS) version. I have rebuilt SymTorrent 1.30 with a new certificate, and now it sould be valid for another year. Please download the latest version if you had problems installing the application."