If you're not sure what to do, then I'd suggest backing off. While I appreciate you want to find the cause you might be out of your depth. There's plenty of professional companies that could deal with something like this to audit the code for badware.
Disclaimer: I run one of said companies in Europe, but am not putting it forward here. If you're in the states you might want to give a company like Trustwave or Matasano a call.
Comments
If you're not sure what to do, then I'd suggest backing off. While I appreciate you want to find the cause you might be out of your depth. There's plenty of professional companies that could deal with something like this to audit the code for badware.
Disclaimer: I run one of said companies in Europe, but am not putting it forward here. If you're in the states you might want to give a company like Trustwave or Matasano a call.