Avast anti-virus incorrectly detects ACFPDFUI.DLL as a "virus" and deletes it. This is called a false positive.
To install Charting Companion on a system protected by Avast, you need to temporarily suspend Avast.
Click on the Avast icon in the System Tray (bottom right) to open up the Avast control panel.
Click on:
1. Settings
2. Active Protection
3. File System Shield
4. Turn off for 10 min or 1 hr. (button at right)
5. Install Charting Companion
6. Click on General, Exclusions, Path, browse to:
C:\Program Files (x86)\Charting Companion
and select.
7. Turn back on Avast File System Shield
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