I am a computer engineer, and I like to try various PC products, I have to admit that SmartPCFixer has done a really good job from my professional perspectives. Its process logic is scientific and effective for many common computer problems. As a result, It has done many works and saved a lot of time for me at a low expense. I think it will become a new trade in IT.
---- Sara Catharine
With your program it was quick, easy and very effective.
---- Sandy Abraham
1. Remove the application which you installed lately.
Run SmartPCFixer, choose System Tools, and click Uninstaller, then choose the program 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 get rid of lr error code 400 problems.
Please visit Microsoft website to
Windows 10 system restore:
Windows 7 8 system restore: