WinUtilities - a nice collection of utility to clean the registry keys, and disable start up programs

Revo Uninstaller - a nice little program that strips out unwanted programs

PowerPack3 - a nice little utility that allows you to limit the access to certain windows functions with editing the security or group policies

switch off - a great little program for restart or shutting down your computer are a specific time.

when file associations have been corrected, and MSC will not load or install, this registry key will fix it

One of the many version of Malware Bytes - a passive virus scanner

When file associattion have been corrupted, this will fix it. Registry Key entry

Office guide