1)   Background Optimizer 1.4
When your computer idle Windows Optimizer will start to fix slow computer, clean disks, install updates, defragment – everything that usually requires specialist to complete and uses additional time and requires unoccupied computer.

 2)   SpeedOptimizer 3.0.9.5
SpeedOptimizer 3 optimizes your Network & Internet connections. The latest version expands SPO to a suite of tools, designed to optimize and fix problems in your registry, temp. Files folder, and system settings as well.

 3)   Slow Computer fixer 1.4
When your computer idle Windows Optimizer will start to fix slow computer, clean disks, install updates, defragment – everything that usually requires specialist to complete and uses additional time and requires unoccupied computer.

 4)   System Cleaner 5.90
Fix your PC's problems, and help prevent them from recurring with System Cleaner's suite of maintenance tools. System Cleaner restores your PC's performance, frees up wasted disk space, prevents registry corruption and protects your online privacy.

 5)   Fix PC Errors 4.70.2048
Fix PC Errors with RegTOOL and restore your computer to like-new condition. In under two minutes it can detect and repair corrupt paths, outdated shortcuts and duplicate entries in the Windows Registry. - Free Download

 6)   RegTOOL 4.62.47
RegTOOL will fix PC errors and restore your computer to like-new condition. In under two minutes it can detect and repair corrupt paths, outdated shortcuts and duplicate entries, sweeping away the hurtles to optimal PC performance. - Free Download