Sometimes it is just a false positive. But to ensure your computer is free of virus, you can run some other free anti-virus programs to scan the system and delete any suspicious infections if found.
Now, for scans:
Firstly, run a scan with Malwarebytes Antimalware (the Free version is fine, you don't need to activate the Pro trial). Scan with it, delete whatever it finds, reboot and post the log here. Download it from here:
https://www.malwarebytes.org/mwb-download/
Secondly, run a scan with AdwCleaner. Same as above, scan with it, delete what it finds, post the log file here.
Thirdly, run a scan with malware removal tool.
http://www.okpckit.com/SpyHunter_Download.php (It provides free virus scanner)