Do you have Malwarebytes or Superantispyware on your computer? If so have you tried a scan? If you can get on-line you could try downloading iobit Malware Fighter free from iobit.com and do full scan. I picked up a Trojan the other day despite having loads of protection by opening a genuine looking e-mail and iobit Malware Fighter found it straightaway.
Alienware 17 R4 2017 review