PerfectRegistry - PerfectRegistry cleans up invalid registry errors using an advanced scan engine. The application repairs invalid registry entries and also defragments the registry, for a more streamlined and smooth system performance. PerfectRegistry 2. 0 has an easy to use interface, which makes it simple to repair all registry errors quickly. Key Features Include: Prevents system crashes, BSOD and other errors. Defrags and compacts the registry Fixes invalid registry errors. Improves overall PC performance and response time. System requirements: Windows 8, 7, XP, Vista.