Hi and welcome to Geeks to Go, I am sure we can assist you with your problem
i have run microsoft anti spyware and norton anti virus but nothing has come up and they are both up to date
It is very possible you are not dealing with any bad software.
So open up Windows Media Player, on the menu bar goto -->View -->Enhancements -->Play Speed Settings
You will notice a new thing on the bottom of WMP, you will see the play speed, enable "Snap Slider To Common Speeds". The select "Normal" or you can set the speed to "1.0"
I hope I have helped you solve your problem, have a Merry Christmas, God Bless.