PC performance optimizers are software utilities designed for Microsoft Windows operating systems (Windows XP, Windows Vista & Windows 7) whose purpose is to clean, repair and speed up computer systems and optimize user experience. Description PC performance optimizer functionality can be divided into three types: # Cleaning - deleting redundant files and unwanted configuration data from the windows registry # Repairing - installing essential updates using a repository of spare parts # Tuning - tweaking user default settings in order to reduce processing power wasted on low priority tasks. PC performance optimizers, notably Registry cleaners, allegedly improve the performance of computers by ridding the registry of redundant data and deleting unwanted malware, errors and corrupted dll files. Noted Windows architecture expert, Mr. Mark Russinovich has concluded that Registry cleaners are likely to continue to have a role until the majority of desktop applications moves into .NET Framework platform (that has no reliance on application registry settings). The tune up utilities supplied by most PC performance optimizers are popular - but it is likely that new versions of Windows will offer such capabilities for free on all operating system types in the near future. The PC performance optimizers market is still undefined in many ways. The average PC user finds it hard to distinguish between legitimate software tools and scareware that appear to offer solutions to vague performance problems.