Ultra Defragger is malware disguised to be a computer defragmenter and optimization program. It actually hijacks your computer and stops you from running any executables. Ultra Defragger simulates a computer error repair and optimization program, that scans your hard drives and memory for problems.

When Ultra Defragger is started and you attempt to run programs or delete files, several error messages will display. You will be prompted to scan your computer with the program. A message will appear that states there are a variety of issues it cannot resolve, until you purchase the program.