Hello Iranzu.c.r,
As per the description above, you want to remove Adobe Reader DC as your default PDF viewer, Is that correct?
Please try the following steps to remove Adobe Reader as your default PDF viewer:
- Right-click on one of the PDF file, select Open with -> Choose Default program.
- Choose Acrobat as the default PDF viewer & checkmark the "Always use the selected program to open this kind of file".
- Click OK to confirm.
You may also refer to the following Adobe article Associate PDF files to always open in Acrobat or Reader on Windows 10
If the issue persists, you may uninstall Adobe Reader using Acrobat cleaner tool Download Adobe Reader and Acrobat Cleaner Tool - Adobe Labs
Reboot the machine and install Adobe Reader from Adobe - Adobe Acrobat Reader DC Distribution
Feel free to update this discussion if you experience any issue.
Thanks,
Anand Sri.