Trojan Ransomware Police Central e-crime Unit

hi we have had this issue with our computer where it was locked up by this virus at the time we did not know it was a virus and we paid the money , since then we have learned it was a scam and contacted the bank to cancel the card etc we have informed the bank and they have stopped the card but the £100 is waiting to go out , the bank said that the account is safe and that they cannot get any more money when they claim the £100 they will dispute the payment and get it back , they also said as it was paid by paypoint they cannot get any info from there as it is not on a computer system only hand held , when i ran Malwarebytes before it was causeing problems with bitdefender , at the moment we are on bitdefender as we have never had any problems untill now according to bitdefender this virus is a new version of a fbi ransom virus and they are updateing there systems,
when it happened we was on the net then the system locked , at the moment allthough bitdefender gave me a tool to get rid of this problem it is coming up with wgsdgsdgdsgsd.dll is missing ?? not sure if this is part of the virus or not , and woundering about formatting system or getting a different hard drive what do you think thanks for your help