Windows, security, etc.

If you susspect some file to be infected there is few thing you could do:

1. Scan it with the antivirus software you use
2. Scan it with the AV software you don’t use 
3. Scan it with all AV engines available/known/usable …
4. Analyze it yourself

Almost every AV vendor has it’s own free online scanner. Microsoft also has it’s own. Use those services if  you want to check  the difference in AV engines and scan your entire PC. If you want to scan only one or few files, you could use  Virus Total. This service will scan uploaded file with almost all AV scan engines.
If you want to analyze the file yourself, you will probably want to read some tutorials before that. Good one to start is this.