False Positives?

[priop2000]

Hello. I've been using the personal avast for many years and prior to that Norton AV as well as Internet secuirty.  Today I decided to try your Internet Security and when I did the initial full scan, it showed the following viruses:

msvcr80.dll
msvcp80.dll
msvcm80.dll

I deleted them as per the recommendation.
From what I see online, these do not seem to be dangerous files and I have not had any PC problems.  Avast personal never found this and like I said, I just switched.  Is there a false positive issue with these files?  Not sure if it matters but PUP is disabled.

[igor]

What malware was reported in those files?
Have you really deleted the files, or rather moved them to Chest?

[priop2000]

It showed HIGH severity and recommended to delete them.  It showed THREAT: Rootkit Hidden File.  I plan on recovering soon so when it finds these again, what should I do and until I recover, will this affect my OS or other applications?