I hope till now Trojan.kotver!gm2 must have been removed. Yeah, it is always better to try some free tools as in this case for Trojan.kotver!gm2 Trojan removal. You need to check whether the infected files can be quarantined if not deleted permanently. Check this removal guide if it works for you..... http://www.removemalwarevirus.com/how-to-remove-trojan-kotvergm2-completely-from-windows-system