Is this any threat?

[zone12]

I did a quick scan and this showed up.

Files Infected:
C:\WINDOWS\system32\iexp_log.txt (Malware.Trace) -> Quarantined and deleted successfully.

[Asyn]

I did a quick scan and this showed up.

Files Infected:
C:\WINDOWS\system32\iexp_log.txt (Malware.Trace) -> Quarantined and deleted successfully.

It's just a trace, but as you got it, you should do a full scan or boot time scan (32bit only).
Also you can scan your system with free Mbam..! http://www.malwarebytes.org/mbam.php
asyn