Thank you for the quick response first!
Forgot to mention - I already scanned with Malwarebytes Anti-Malware,Microsoft Security Essentials,AVG Free,Avira and Avast,but they didn't find anything.Only Avira blocked the access to the file and when I press to delete the file it is not moved to quarantine and everything starts again.I don't know a lot about viruses but I think that in very short time it does what it does and then its deleting itself, Im saying that because Avira showed me directory of the file but I can't find such directory and file.