The most intelligent part of SmartPCFixer is that it could identify junk software and useless registries, then it will delete them. I can check my computer's health condition anytime I want. And I could instantly find out what is slowing down my PC. Easy to function and easy to handle. I really appreciate this software. I believe I will keep it in my computer forever.
---- Gill Louis
I am not a speaker, I can say that I am a fan of it.
---- Caesar Bacon
Smartpcfixer is a well-known system repair software which is able to identify and repair issues of your operating system automatically. It's 100% safe and clean.
This tool is not only good for resolving 421 error code issues, but also is able to scan, check your windows errors periodically.
Why should you choose SmartPCFixer?
1. Remove the program which you installed lately.
Run SmartPCFixer, choose System Tools, and click Uninstaller, then choose the software you have just installed.
2. Update your Unknown to the latest version.
For windows 7 users:
Click Start, and search windows update as the pictures below:
Click check for update, and update all the important updates which windows recommend for you.
3. System restore is always the best way to fix 421 error code problems.
Please visit Microsoft website to
Windows 10 system restore:
Windows 7 8 system restore: