how to clean registry and speed up windows?

Clean and Optimize Your Registry:
This is a simple guide on how to clean your windows registry, repair errors and remove unused registry entry's
first of all you will need to download and install a software from COMODO. you can download here
"Download System Cleaner"
after downloading it. install and run.

there is also a portable version where you can just run it from your USB flash drive. no need to install
you can also download it here "System Cleaner Portable"