Whats a FAST reformat vs a SLOW reformat in WIN XP?

[inquiring]

Whats the difference between a FAST reformat and a SLOW reformat when I reinstall WIN XP Home? I got a damned WinFixer ad ware crap program that keeps reappearing after I re install windows XP and did a FAST reformat. Wouldnt that wipe out that Ad -Ware?

Thanks.

 

[pscowboy]

Fast format only erases the file record at the top of the hd. All the folders and files remain in place.

As long as you started over anyway, why not wipe the drive?