I've got a same problem with you..
And this is how i cleaned this trojan.
- Update ur avast
- Do boot-scan
- After that, make sure tht there'r not QXZV.exe at ur WINDOWS/system32
- Usually, this trojan made ur host file become 5MB (with some random data), so correct ur file host..
- Look at ur registry (run-regedit), FIND wmiptsd, then delete it, or modify binary first (delete all the binary data)
Find wmiptsd again till there's no more wmiptsd at ur registry.
- Finish. our computer hv cleaned from that trojan.
NB: usually, this trjn damaged some file at ur system, so u cant go to safe mode. Then u have to repair ur operating system after cleaned the trojan