MSE says that there is a virus in my Avast! temp folder

[virusinmyavast]

Hello fellow Avast! users,

The past few days, Microsoft Security Essentials has been telling me that there is the JS/iFrameRef Trojan in this folder:
 file:C:\Windows\TEMP\_avast_\unp13901562.tmp . My virus chest is empty, and Avast! has never once detected anything on my system, so why is this appearing in my temp folder? As far as I can tell, I can't find that file in the location is states or in the AppData temp folder. If anyone has any idea what the deal is with this, please let me know.

[Asyn]

Please uninstall MSE..!!

[AdrianH]

Firstly you should not have MSE and Avast running on the same machine.

Remove MSE and clear temporary files, then try an online malware scanner for a second opinion.

[virusinmyavast]

So since neither of you say anything about the virus, I assume that the consensus is that it's a false positive from MSE? Then what does Avast generate in it's temp files that would look like a virus?

[Asyn]

So since neither of you say anything about the virus, I assume that the consensus is that it's a false positive from MSE?

Yes.

[Pondus]

This is the result of installing multiple AntiVirus

[Lisandro]

Even making mutual exclusions, you'll have a lot of resources and, mostly, the possibility of a conflict all the time...

[DavidR]

So since neither of you say anything about the virus, I assume that the consensus is that it's a false positive from MSE? Then what does Avast generate in it's temp files that would look like a virus?

That is where avast sends or unpacks files which it is going to scan (these are temporary files created and named in that file name format unp99999.tmp, not the originals). This is classic conflict avast is creating the files in that location and MSE is hooking them so they can be scanned, that act stops avast scanning the file as it is locked by MSE. This conflict can leave your system less well protected.

So the c:\windows\temp\_avast_ folder should be excluded in MSE. But essentially as everyone has said exclusion isn't the way to go. Having two resident anti-virus scanners installed is one too many and not recommended as rather than provide twice the protection it can cause conflicts that could leave you more vulnerable.