Bypass Windows Boot Up

I am running Windows Xp pro and i tried to install Windows Media 2005. I stated to install the Windwows Media and it asked to reboot (Without the full installation).

I took the Windows Media Centre cd out and Windows staretd to reboot.

This is where the problem is

When my computer boots, before it gets to Windows, it goes to a screen asking me to either click on to start Windows Xp Pro or to install windows Xp pro.

If I am not quick enough and I don?t click onto the option of going to start Windows Xp Pro, it goes to a blue screen asking me to put in Windows Xp pro with SP2 on.

Is there a program or something I can do to bypass this problem