Hello
Avast netclient edition 4.7.820.0 Vps ver.080520 indicates that in c:\windows\temp\siwio.sys is win32:trojan-gen{other}
It is FALSE ALERT !!! ITS not a virus or trojan !!!
See here http://www.greatis.com/appdata/a/s/siwio.sys.htm
Its a file/log from SIW program. SIWIO.SYS is a part of System Information for Windows software.
http://www.gtopala.com/
Why does Avast show it as a Trojan !!!