From Developer Tribe:
Developer Tribe is proud to announce the portable version of its existing registry cleaning software i.e. Registry Recycler. Registry Recycler Portable is same as its installer version but allows users to repair, clean, and fix Windows registry from errors without having to install it. You can now have it in any of your storage device such as a USB or a flash drive and can use it on the go. All of its features are designed to make your system efficient and free from registry threats.
Clean Registry Errors - First comes its strong Scanner, which thoroughly checks registry values for errors and then prompts you to fix them. This will optimize your registry for best PC performance. Defrags Fragmented Registry - Registry Recycler Portable is also able to defrag the fragmented registry hives, which organizes the entire registry to ensure your system stuck or delay in loading programs installed on it.
Safe to Use - You must not worry, when using Registry Recycler as it is completely safe. It automatically creates backup of your existing registry settings and allows you to restore, whenever needed. Disable Startup Apps - Its user interface also allows you to disable startup programs to speed up Windows boot time.