Add punctuation: Uninstallation As DLL files are created to support other programs and softwares working well the data and functions are actually shared by many programs when you uninstall a program custerrdll may be mistakenly deleted
A: Uninstallation: As DLL files are created to support other programs and softwares working well, the data and functions are actually shared by many programs. when you uninstall a program, custerr.dll may be mistakenly deleted.

Add punctuation: Shoot either a clay or a penguin that are thrown out
A: Shoot either a clay or a penguin that are thrown out!

Add punctuation: 387 USD Standard group course Chinese Course 20 lessons per week 50 minutes per lesson
A:
387 USD Standard group course (Chinese Course - 20 lessons per week - 50 minutes per lesson)