Then the keys are at least somewhere in the wallet file... Providing you did definitely verify the signature the wallet was installed iwth.
That is the weird part, I am sure that I have made enough research before downloading the Electrum, and validated the signature today, nothing seems off. Note that I am using portable version so it might not be as safe as normal installer.
The portable version is safe, I use it because I'm lazy.
You just have to stick to using trusted machines with it otherwise that's where the vulnerability appears.
What is the balance if you don't mind sharing it?
Not much, but still an important fund for me.
Could you send me one of the signed messages to check it definitely signs from the right addresses (you can do that via pm)?
I will send one for you, but I have checked several times and conclude that the private keys simply are wrong.
Yes the private keys are definitely wrong.
Without being able to see the wallet file I don't think I can do anything and I don't think it's a good idea for me to get that just in case you have a virus and the virus sends some of the coins to me to make it look like I stole them for example...
Have you encrypted the whole wallet file or added a password to the wallet? If not, then open up the wallet file (it'll probably be in the directory where you launch electrum from in a folder called "electrum_data"). If unencypted it'll list the transactions, addresses and private keys...