I want to change OSs, should I use Win XP's DELETE PARTITION or ZERO-FILL?

[rocket1406]

I've never used Zero-Fill before and really don't know what it is (except for the fact that it makes all the sectors say 0 or something).

http://www.seagate.com/support/kb/disc/faq/ata_llfmt_what.html

I read that, should I download it and do it.

Or is the Win XP Delete Partition good enough?

***Note: I'm trying to figure out what's wrong with my computer. It has major lag/slowdown issues.

 

[rocket1406]

Also, does this delete TOO MUCH?

Like, will I still be able to immediately INSTALL WINDOWS XP after I Zero-Fill (I WANT TO MAKE SURE IT DOESN'T DELETE THE BIOS OR SOMETHING)

 

[winterfreshpwnz]

I don't know about that other thing, but I have reformatted a million times with the windows xp disc and it is extremely simple so I'd just do that and get it over with.