When I go on the internet a window comes up that says if your cmputer is runing slow you might be infected by spyware and my computer does run slow and it does not shut down at all and i have no protiction.

Download *Hijack This!*
http://www.merijn.org/files/hijackthis.zip
http://www.mjc1.com/mirror/hjt/
http://downloads.net-integration.net/HijackThis.exe
http://www.computercops.biz/downloads-file-328.html

Unzip to a folder other than your Desktop or the Temp folder. Then, doubleclick HijackThis.exe, and hit "Scan".

When the scan is finished, the "Scan" button will change into a "Save Log" button.
Press that and copy & paste its contents here.

Most of what it lists will be harmless or even essential, don't fix anything yet. Someone will be along to tell you what steps to take after you post the contents of the scan results.