I need to repair my Windows XP software on my system and I've been researching it and it says I need to set my system up to boot Windows XP from the disk. The only thing is I don't know how to set my system up to automatically boot from the CD-ROM. Is there someplace I can go to change this option? Any help would be appreciated.

I have windows xp professional service pack 2 and I want to know If I can do a clean install of the os with out having to format my hard drive?
yes but if I install the new os without uninstalling the otherr one I willhave 2 partitions which I dont want.

My computer will freeze up when I try to install certain software programs. I havent figured out the pattern yet because certain OTHER programs will work just fine!? It will even freeze my computer when I try to install utility programs to run diagnostics on my computer and 3 different anti-virus programs come up zilch. Can SOMEBODY help me!? lol

And where do I get it?

My biggest concern is, I'm wary letting a program dig into my computer, I have no way of knowing if it's going to imbed spyware or virus or something on my system, or steal my information. I see pop-ups for cleaners all the time, but they don't come off as legitimate.