Autodesk 3ds Max 2012 Keygen

I recently got AVG warnings about a Trojan in a keygen.exe file. It's been my experience that AVG can give out false positives when it comes to certain files. But I also did a scan with Malwarebytes and got another warning. How can i be certain I haven't been infected? I have a Windows 7 OS below is the Malware log:
Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.org
Database version: 6186
Windows 6.1.7600
Internet Explorer 8.0.7600.16385
3/27/2011 7:49:59 PM
mbam-log-2011-03-27 (19-49-59).txt
Scan type: Full scan (C: D: )
Objects scanned: 637390
Time elapsed: 2 hour(s), 59 minute(s), 37 second(s)
Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 1
Memory Processes Infected:
(No malicious items detected)
Memory Modules Infected:
(No malicious items detected)
Registry Keys Infected:
(No malicious items detected)
Registry Values Infected:
(No malicious items detected)
Registry Data Items Infected:
(No malicious items detected)
Folders Infected:
(No malicious items detected)
Files Infected:
d:my documentsdownloadsautodesk 3ds maxCRACKCrackxf-a2011-64bits.exe (RiskWare.Tool.CK) -> Quarantined and deleted successfully.