Advanced System Optimizer (formerly Advanced Vista Optimizer) is a software utility for Microsoft Windows. Advanced System Optimizer has utilities for optimization, speedup, cleanup, memory management, etc. The registry cleaner has 12 categories of registry errors and can detect and delete registry errors. Subsequent versions of Advanced System Optimizer have included several improvements over the first incarnation of the software. The Smart PC Care feature is one such example, working to carry out multiple tasks on the machine simultaneously. Most of these features made their way to the software platform with the release of Advanced System Optimizer 3, which is compatible with Windows XP, Vista, and both 32-bit and 64-bit installations of Windows 7.