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Windows Defender Offline? Be aware that Windows Defender is designed to catch spyware, nothing more. Microsoft Security Essentials is the full malware protection version of Defender.
As for checking for HDD failures, beyond the Crystaldiskinfo, you can try doing some Seatool tests. Do the SMART Test (if available), Short DST, and Short Generic tests. Short Generic and Short DST should only take around 1-5 minutes. If they run a good bit longer than that, then you have a mechanical failure, most likely a head or drive motor failure. If the tests fail, well, you know what that means. Understand this is not a 100% guarantee that it'll detect a bad drive. If the test fails, the drive (or at least some part of the disk I/O process) is bad, but if the tests pass, that doesn't mean the drive gets the green light. Only sure way of testing a drive is to swap it with a reliable one and test system stability on that.