Schedule a boot time scanning with avast with archive scanning turned on. If avast does not detect it, you can try DrWeb CureIT! instead.
Use Comodo Cleaning Essentials (CCE), or MBAM, or SUPERantispyware to scan for spywares and trojans. If any infection is detected, it is better and safer to send the infected file(s) to quarantine (Chest), rather than simply deleting them.
Read these instructions and provide more info with the logs generated. But, please, do NOT post there, open a NEW thread for your specific problem and help us to help you.
Clean your Hosts file (replacing it) with HostsMan tool.
Disable System Restore and then reenable it again.
Please give more info…where is it located on your computer?? how it was found?? and if u have got infected with it please do take the effort to send the infected files that are undetected to virus@avast.com and keep them password protected and specify password in e-mail body