I can programming an Internetblockingprogram for Win.
Python is very good for this job.
I programming a init-file, which must be run before the first start auf the Main Program.
The Init-File changes an parameter in the Windows Registry, how the Proxy is filled in.
The Main Program can displayed an proxy, that sends the request to an iTALC Proxy.
I'm from Germany, so my English is not very perfect.
Python is an Interpreter language, but a Program named CX_FREEZE can compiled it in an *.exe File.
OKay, I hope I can help you.