hi, i just recently purchased avast , please can someone help me is this a false positive ? hmpalert.dll in c:\windows\system32 . hmpalert.dll in c:\windows\syswow64. detected as virus win32.DH thankyou for your help 
Submit the file to virustotal and post the link to the result here.
Do you have (or had) Hitman Pro installed ?
hi, yes i have hitman pro and hitmanpro alert installed
That is likely the problem.
Remove Hitman Pro completely if you want to use avast.
https://blog.kaspersky.com/multiple-antivirus-programs-bad-idea/2670/
thankyou for your help
You’re welcome.
Clearly you do not understand that hitmanpro and HitmanPro.Alert are different programs.
Clearly you do not understand that hitmanPro is an on-demand scanner that does NOT conflict with Avast, or any other resident AV.
Clearly you need to do some research before giving false advice.
And very clearly you have no clue how things are working.
Oh, I understand better than you surmise. Like I said, do some research.
win32.DH seems to be a AVG detection name … or is now avast/AVG signatures merged?