thanks for replying fast.

in the meantime I found out how to reload the blockchain in multibit and the fake transaction disappeared from the interface  + btc balance is correct.
i'm letting go the idea to make another software wallet and wait for the hardware device.
Thanks again.

i started to use electrum, importing private keys from a multibit classic account. as such i can see my btc Both in the old multibit interface as on electrum. some days ago a hacker tried to take out my coins using multibit. indicating that my multibit private keys are corrupted. but the transaction stuck, as indicated by a little square instead.of the usual confirmation sign.  the coins disappeared from multibit but not from Electrum... i thought best thing would be to save the btc from the electrum wallet in a new wallet, but on trying that electrum stalls... windows error. what shoud i do next ? i ordered a hardware wallet, but can i still leave the coins on the electrum wallet for now? if not, how to get the electrum to work again? thanks.