Why don't you ask Crono? He sent you the program. From the looks of it though, (suspicious firewall activity and writing to system.ini), he may have sent you a trojan.

It might look like you have it fixed, but check your startup configuration (Start->Run, and type "msconfig") for anything suspicious.

Anyways, how old are the definitions on your virus scanner? A virus scanner is useless against new viruses unless you have up-to-date definitions. Virus scanner software companies offer update subscriptions for a nominal charge (like $5 per year) but it is well worth it to keep your computer protected from viruses. If the problem is actually a trojan, a virus scanner will be able to detect it unless it is homemade or something (which I doubt that Crono could do).

Purposely putting anything malicious on someones computer is illegal, so if you are sure it is a trojan (or any other kind of malicious program) you should go to his ISP and report it.