So the best thing to do would be "export PK" and than "import PK"?
I dont mind if the multibit takes 3 days to synhronize i'm just affraid to lose my bitcoins...
So...brand new instalation and just import private keys?
If you trust me, you can send me all the bitcoins from your wallet.
Then once you have the new wallet set up and you are confident that it is working properly I'll send the bitcoins back to you. That way you won't lose your bitcoins if you accidentally lose your old wallet.
Of course, it can be risky to trust someone that you don't know, so you'll have to decide for yourself if you feel I'm trustworthy enough to assist in this manner.