Two day ago my website was banned by all browsers because there were some malicious script at the very top of my index.php file. I have no idea where this script came from. Removed it several times but it appears again after several hours. I have already contacted my hosting provider and the only advice from them was to change the password. Although that didn’t solve the problem. Any ideas?
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You have most likely been hacked. Somebody found a little backdoor in your php scripts which he exploited to gain access to your files.
I suggest as a first step you read the very basic documentation here: php security manual
and then continue with other resources on the internet. Php security is not to be taken lightly as it can compromise your whole website (as it is your case)