HDD Defragmenter is just one of those fake computer error repair and optimization programs that normally imitate scanning of hard drives for problems. Typically, HDD Defragmenter spreads through trojans viruses that attach themselves to doubtful origin flash updates or fake video codecs misleadingly required for watching something online.

Having got inside the system, HDD Defragmenter drops a number of odd-named files whose function is to act as system files that later will be detected as dangerous infections. To “find” them, HDD Defragmenter performs frequent security scans and then asks its victims to buy registered copy in exchange for PC security services. However, keep in mind that there is nothing that has to be removed from your computer instead of this scamware. Get rid of HDD Defragmenter as soon as you notice it and never purchase it as well!

You must have figured out HDD Defragmenter is not a real anti-spyware thing and it will show up out of nowhere when you login to Windows. Being released for only ripping users off, it will definitely block some important programs on your machine and then will display various system security notifications and error messages like these:

System Error!
Exe file is corrupted and can't be run. Hard drive scan required.
Scan Hard Drive

Windows cannot find 'notepad'. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

Requested registry access is not allowed. Registry defragmentation required
Read time of hard drive clusters less than 500 ms
32% of HDD space is unreadable
Bad sectors on hard drive or damaged file allocation table
GPU RAM temperature is critically high. Urgent RAM memory optimization is required to prevent system crash
Drive C initializing error
Ram Temperature is 83 C. Optimization is required for normal operation.
Hard drive does not respond to system commands
Data Safety Problem. System integrity is at risk.
Registry Error – Critical Error

Scan Hard Drive
Windows cannot find ‘notepad’. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

Critical Error!
Damaged hard drive clusters detected. Private data is at risk.

Critical Error
Hard Drive not found. Missing hard drive.

Critical Error
RAM memory usage is critically high. RAM memory failure.

Critical Error
Windows can’t find hard disk space. Hard drive error

All this information is fake and misleading, so you should never believe it. If you try to use HDD Defragmenter, first of all you will be asked launching Safe Mode but then you will be showed a fake Safe Mode background. So, instead of following its instructions, remove HDD Defragmenter as soon as possible to save your PC.