freezing during boot

[runningirl07]

My Dell notebook has recently been freezing up a lot while booting. It gets stuck on the first screen with the Dell logo and hit F2 to enter setup, etc. I have to turn it off via the power button and reboot it. I'd say this is happening almost half the time I start my computer.

I run Adaware/Spybot/AVG very regularly, and don't visit and sketchy websites or think I have spyware/virus.

The notebook is almost 2 years old.

Any ideas why this is happening?