There is a computer running windows at my place and generally on startup it is causing unusual high hard disk drive activity. I checked and found that there is CompatTelRunner.exe is running and is doing lots of disk reading. Sometimes it runs for long on startup and some times its just quick.

Now I am worried, is it safe to let it run because on line search reveals its from Microsoft and its about keeping system upto date but then why it is causing so much hard disk activity everytime ?

I think it also slows my system a little because hard drive is constantly busy. How can I disable this file and what will it affect if I disables it ?