You have heard it before.
I'm a professional at this but this one has me stymied. Cleaned a Vista Home Basic machine from several rootkit/virii. The main one was the one that disrupts and disables MicroSoft Security Essentials. Have a clean install of Security Essentials finally and the machine reports clean on everything I've run to scan it. Yet downloads are not saving - all are marked as virus - from Chrome or IE.
Virus Scan was only Security Essentials. AVG never installed here. Norton was original AV but removed long long ago.
So - have you had any success resolving this? Let me know what I can do to provide you info to resolve it.