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I update my Xperia Arc to the new v4.0.2.A.0.42, in this version i try remove the unuse apps "McAfee Security". It really does, but after I reboot my Xperia Arc, the McAfee will AUTO REINSTALL.
I really wan to remove the apps, because it will always came out in notification bar, anyone know how?
Open 'settings'-
open 'location and security'-
open 'select device administrators'
here you will see Mcafee listed, uncheck the square box in front of it. Close all of it and now uninstall Mcafee like any other application.
try this 
Really the square box is uncheck, same, McAfee will install back when i revoot the device.
this was helpful for some user:smileyplain:
i'm sorry dont know beyond this..
Can any Sony Ericsson SEAnswers answers this?
it seems that some users can't uninstall it, you can always debrand your phone
and also wait for a SE moderator to reply
can i removed lock xperia lt18i
http://service.mcafee.com/FAQDocument.aspx?lc=1033&id=TS101143
you do this solution for remove that programme