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.

I have heard that some People have had problems after installing new updates on XP machines. The problems are different so I will not try to explain how to fix it. I will remind you how to ask for help . Of course you could always use your favorite search engine to find a solution, but if the problem arose after applying some new update, you will probably found nothing. So, the best thing to do is to ask for help.

Start a free Windows Update support incident request and ask for help:
https://support.microsoft.com/oas/default.aspx?gprid=6527
https://consumersecuritysupport.microsoft.com/
http://support.microsoft.com/ph/6527#tab3

Hope this will help you next time you find yourself in helpless situation.