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What would be helpful to others is what tools did you try and what results were found.
What was the malware name, the infected file/s name and where it was located, e.g. (C:\windows\system32\infected-file-name.xxx) ?

If malware is found, then if possible you should send samples to avast so that detections can be improved.

Send the sample to virus@avast.com zipped and password protected with password in email body and false positive/undetected malware in the subject.

Or you can also add the file to the User Files (File, Add) section of the avast chest where it can do no harm and send it from there (select the file, right click, email to Alwil Software). No need to zip and PW protect when the sample is sent from chest. A copy of the file/s will remain in the original location, so any further action you take can remove that.

Welcome to the forums.