tell me

[Mikseri]

Hi.I lost 18k xp because   i change computer :/ .Could you beck my xp?

[DFighter]

did you save your ETkey you can find in ETmain map of enemy territory ? if you haven't I think you can't get your xp back 
best is to make a backup from your etkey 

[Mikseri]

i havnet etkay.Hi df im casamova from FUN

[DFighter]

if you didnt save your etkey you cant have xp back and you have to start over again
if you are smart you make a backup from your etkey for example in your email even if your pc crashes you always can copy your etkey back then 

[Pepperonipizza]

Your xp is linked to your ETKey. Your ETKey is yours and yours alone. We do not have a copy of it. If you did not save your old ETKey anywhere, your xp cannot be recovered.

 

I encourage you to make a backup of your new ETKey. Here is a tutorial for doing so: http://fearless-assassins.com/tutorials/article/198-backing-up-restoring-your-etkey-guid/