If you have anti virus installed you can still pickup infections. Remember to run your anti virus one a month manually for best results. When your software tells you no infections but the computer is noticeably slow then you need to check for imbedded malware.
Microsoft offers a free tool that will find problems and allow you to remove them. While this is a free tool it will not remove all malware. If you run the scans on your computer and it still bogs down give us a call and let us make it run like new again.
Here is the link to Microsoft’s free scanning tool.