Trojan???

[Malware Removal Specialist]

OK, go to C:\qoovox and delete the entire contents.

Also delete Combofix.

As for the slowness, we can do some cleanup procedures.

See this post to install and run CCleaner.

Next install and run Auslogics Disk Defrag

To learn more about how to protect yourself while on the internet read this article by Tony Klien: So how did I get infected in the first place? It mentions many free programs so it is worth a look.

Any questions, just ask.

Safe surfing.