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Microsoft Security Intelligence
Published Nov 10, 2010 | Updated Sep 15, 2017


Detected by Microsoft Defender Antivirus

Aliases: PC Repair (other) TR/FakeSysdef.A.20 (Avira) Trojan.Inject.12360 (ESET) Mal/FakeAV-EA (Sophos) Trojan.FakeAV!gen28 (Symantec) HDD Defragmenter (other) Check Disk (other) Windows Repair (other) WindowsRecovery (other) Windows 7 Recovery (other) Windows XP Recovery (other) Data Restore (other) Disk Defrag (other) Disk Doctor (other) Disk Helper (other) Disk Ok (other) Disk Optimizer (other) Disk Recovery (other) Disk Repair (other) Disk Tool (other) Easy Scan (other) Fast Disk (other) File Recovery (other) Good Memory (other) Hard Drive Diagnostic (other) HDD Control (other) HDD Diagnostic (other) HDD Fix (other) HDD Low (other) HDD Ok (other) HDD Plus (other) HDD Repair (other) HDD Rescue (other) HDD Scan (other) HDD Tools (other) Memory Fixer (other) Memory Optimizer (other) Memory Scan (other) Quick Defrag (other) Quick Defragmenter (other) Smart Defragmenter (other) Smart Hdd (other) System Defragmenter (other) System Diagnostic (other) System Fix (other) Ultra Defragger (other) Win Defrag (other) Win Defragmenter (other) Win Disk (other) Win Hdd (other) Win Scan (other) Win Scanner (other) Windows Diagnostic (other) Windows Disk (other) Windows Fix disk (other) Windows Restore (other) Windows Safemode (other) Windows Scan (other) Windows Tool (other) Windows XP Restore (other) Windows 7 Restore (other) Data_Recovery (other) Data Recovery (other) SMART Repair (other) S.M.A.R.T. Repair (other) SMART Check (other) S.M.A.R.T. Check (other)


Windows Defender Antivirus detects and removes this threat. 

This family of programs claim to scan for hardware defects related to system memory, hard drives and over-all system performance. They show fake hardware problems and ask you to pay money to repair them.

The following free Microsoft software detects and removes this threat: 

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

Additional remediation instructions for Win32/FakeSysdef:

Additional instructions to remove Win32/FakeSysdef from your PC are available below:

This threat may make lasting changes to a computer's configuration that are NOT restored by detecting and removing this threat. For more information on returning an infected computer to its pre-infected state, please see the following article/s:

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.