Your system may be messed up by Trojans.DNSChanger.acm virus:
Trojans.DNSChanger.acm which is able to attack computers with Windows operating systems is a pesky Trojan horse that newly designed by cyber criminals to damage the infected system severely from many aspects. The most harmful function of Trojans.DNSChanger.acm is the ability that helps cyber hackers connect to the infected computer remotely without users’ approval. Your privacy saved on the machine may be put at risk after the infiltration of Trojans.DNSChanger.acm.