False positive

C:\hp\bin\KillIt.exe it’s not a trojan or a virus it’s a part of H.P / COMPAQ computers so fix it as I am fed up of chesting it only to take it out a week later

To know if a file is a false positive, please submit it to VirusTotal and let us know the result. If it is indeed a false positive, send it in a password protected zip to virus@avast.com
Please, mention in the body of the message why you think it is a false positive and the password used. Thanks.
Other possibility is JOTTI. VirusTotal and Jotti both have file size limits 10 and 15MB each.

As a workaround, you can add these files to the Standard Shield provider (on-access scanning) exclusion list.
Left click the ‘a’ blue icon, click on the provider icon at left and then Customize. Go to Advanced tab and click on Add button…
You can use wildcards like * and ?. But be carefull, you should ‘exclude’ that many files that let your system in danger.
After that, please, periodically check it - scan it into Chest, right clicking the file - there should still be a copy in the chest even though you restored it to the original location. When it is no longer detected as being infected then you can also remove it from the Exclusion list.

This link is a tutorial on how to help correct a virus detection that you believe to be false:
http://forum.avast.com/index.php?topic=25009.msg204838#msg204838
or http://forum.avast.com/index.php?topic=7779.msg62586#msg62586

Then exclude it and send the sample to avast.

You don’t say what avast detects it as, tools that can do both god and evil are difficult for an AV as it doesn’t know intent.

You should also check the offending/suspect file at: VirusTotal or Jotti as Tech suggests.

If it is indeed a false positive, add it to the exclusions lists:
Standard Shield, Customize, Advanced, Add and
Program Settings, Exclusions)

Send the sample to virus@avast.com zipped and password protected with the password in email body and possible false positive 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.