icpp-online trojan

In Windows XP under one of the users only we see the trojan iccpp-online false data protection screen, when search we realised that this is a trojan. We have used McAfee, Malwarebytes and nothing seems to clear it I can get to all of the files and desktop via task manager/file/new task (run). It will not allow us to download any virus undates for defender from Microsoft.

When we tried to run a Mal ware we got an error 'unsafe DNS server address 93.188.162.195.

We can access the pc via the other 2 users in windows xp but when you search internet explorer in either of these users it redirects us to different sites than the ones we are selecting