How to turn off DEP on XP?

Help anyone plz....this is very frustrating.......i need help turning off that DEP thing on windows XP....every time I want to access my computer properties it gives me the error message......and i cant turn it off ...i have looked this stuff all over the internet....plz will some one help....help would be appreciated...is there away to stop this because i think that this is a virus :S
 
control panal
performance and maintenance
system
advanced tab
settings under performance
data execution protection tab
 
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