Ok few things.

1st. McAfee is just horrible unless you like problems and viri.
2nd. Under no circumstances should you ever listen to anything that your support department from the company who built your computer tells you. The have a book they read from and follow exactly what it says. You ever had a problem that was outlined step by step exactly like in a book on any topic? PCs are no different. I have worked for H.P. Trust me on this.
3rd. When you install firefox your default ie in your recent apps, becomes what is known as IE (No-Plugins) This simply means it will not run any kind of flash, java, active-x, etc. There is a way to pull the old IE back with everything turned on really simply. Just browse your start menu and it will be there listed as (Internet Explorer). Simple enough.

For those with McAfee, Norton, AVG, etc. Coming from 20+ years in computers over 12 professionally...dump them. Get yourself a router for a firewall, and use Avast as your Anti-Virus. It updates several times a day usally, gives the best protection and is absolutely free. I have yet to have to go remove a virus on any computer running it.