Smart Defragmenter shouldn’t be mixed up with legitimate security application because it hails from the most rapidly developing family of rogue anti-spywares which includes HDD Defragmenter and other scams. Being promoted on various insecure websites, Smart Defragmenter gets on the targeted PC undetected and then starts its misleading campaign, like reporting of invented errors or harmless viruses:

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

The most typical way to get tricked into purchasing Smart Defragmenter is through fake alerts and system scanners that always report tons of viruses and then redirect victims to get a removal tool for fixing everything reported. However, victims are fooled because they install nothing else but a rogue anti-spyware. System Defragmenter may also come with a help of trojans through security vulnerabilities found. Then it starts seeking to make you purchase its "licensed" version but don’t even think about paying! System Defragmenter is a rogue anti-spyware, so contact your credit card company to dispute the charges because you will only support the scammers.

 When on board and active, System Defragmenter creates tons of random files that are actually harmless but “detected” by the same virus as dangerous. It also configures the system to run executable each time user boots into Windows, so it will start showing all these misleading notifications even at startup:

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

In fact, System Defragmenter’s alerts and scanners are forged, so don’t take them seriously. The final thing this scareware expects from you is to scare you into registering its so called “full” version. You definitely don’t need this, so save your money and remove System Defragmenter. There are some simple removal instructions below, that should help you to uninstall this program.