Delete addons ?

i know where the addons r 2 delete them but because my quest helper is slowly disappearing and i get an error message i want 2 delete all the saved files that is linked 2 the addons ... but im having trouble finding them all .
i know they r not all gone cos when i log in2 the game it still has the check box and pref.
once i have deleted it all im sure i can reinstall it so it works again .... im missing it like hell .
u never appreciate things till they have gone

this is the error message i get !

Date: 2008-05-16 20:14:12
ID: 2
Error occured in: Global
Count: 1
Message: ...ns\Cartographer\Cartographer_Waypoints\Waypoints.lua line 1111:
attempt to call method 'FormatDurationShort' (a nil value)
Debug:
: FormatDurationShort()
...ns\Cartographer\Cartographer_Waypoints\Waypoints.lua:1111: object_method()
...tographer\libs\LibRockTimer-1.0\LibRockTimer-1.0.lua:289:
...tographer\libs\LibRockTimer-1.0\LibRockTimer-1.0.lua:227
AddOns:
AtlasLoot, vAtlasLoot Enhanced v4.05.00
AucAdvanced, v5.0.PRE.3104
AucFilterBasic, v5.0.PRE.3104 (BillyGoat)
AucStatClassic, v5.0.PRE.3104 (BillyGoat)
AucStatPurchased, v5.0.PRE.3104 (BillyGoat)
AucStatSimple, v5.0.PRE.3104 (BillyGoat)
AucStatStdDev, v5.0.PRE.3104 (BillyGoat)
Auctioneer, v5.0.PRE.3104
BeanCounter, v5.0.PRE.3104 (BillyGoat)
BtmScan, v5.0.PRE.3104
Cartographer, vr68896
Enchantrix, v5.0.PRE.3104
EnchantrixBarker, v5.0.PRE.3104 (BillyGoat)
EnhTooltip, v5.0.PRE.3104
Informant, v5.0.PRE.3104
QuestHelper, v0.46.1-c8efe68
Stubby, v52
Swatter, v5.0.PRE.3104