PC Repair System is a great collection of portable freeware applications that are ideal to be taken anywhere on any USB pendrive, which are focused on the maintenance and optimization of any PC that uses the Windows operating system. You will be able to find developments to defrag hard drives, manage processes or eliminate errors from the system registry.
Always take a practical pack of maintenance and optimization tools with you
Among the applications that are part of this pack, it's worth highlighting some, like CCleaner (the popular program to clean and maintain the registry), ProcessExplorer (program with which to be able to stop any application or process in a couple of clicks), ProduKey (a development designed to recover the password of your operating system) or HDDScan (a tool with which you will be able to detect any problem on your hard drive in a matter of seconds).
You can access any application by exploring your pendrive or by means of a menu that will appear on the system tray, which includes a full list of all the developments that you can launch.