so its a process in the sense you can see it in your task manager?
Id go into safemode, then go to start>run and type msconfig then press enter
Then in the new screen choose the tab startup and look for that startup process and uncheck the box then click apply and ok.
If its a driver issue you can go into safemode go to start>control panel>add and remove programs
And look for the modem driver and uninstall it unless you use it?