- Frees space by deleting temporary files, finds duplicate files and makes them disappear;
- Fixes errors by cleaning the Windows Registry, fixing file system errors, and monitoring the health of disk drives;
- Steady performance – auto-tune your applications for maximum speed and optimize your Internet connection with the powerful Live Tuner;
- Privacy protection – wipe all Internet traces from your system and encrypt sensitive data safely. Now, you decide what information is automatically sent to Microsoft on a regular basis;
- Customizes Windows to your needs – get more flexibility by adjusting hidden system settings, altering file type associations or adjusting context menu entries easily.
Download.com review (5 stars - spectacular): http://download.cnet.com/Ashampoo-WinOptimizer-11/3000-2094_4-10224281.html
http://download.cnet.com/CCleaner/ - #1 in Maintenance & Optimization (Download.com)