I attacked by some one who encode all my files & leave me message in text file named BUYUNLOCKCODE.txt could you help

I attacked by some one who encode all my  files & leave me message in text file named BUYUNLOCKCODE.txt including 
Hi, your ID = JSO2850014

All important files were encoded with RSA-1024 encryption algorithm.
There is the only way to restore them - purchase the unique unlock code.

Warning! Any attempt to recovering files without our "Special program" will cause data damage or complete data loss.
As we receive your payment, we will send special program and your unique code to unlock your system.

Guarantee: You can send one of the encrypted file by email and we decode it for free as proof of our abilities.

No sense to contact the police. Your payment must be made to the e-wallet. It's impossible to trace. 
Don`t waste your and our time.

So, if you are ready to pay for recovering your files, please reply this email ChiuKhan@tom.com

Then we will send payment instructions. 
could i have help

ADEL, For removal info have you 'googled' remove BUYUNLOCKCODE.txt virus?..
No AV product is capable of providing you with 100% protection although AVG are always working 24/7.
Have a look @ these 2 articles…
[1] (https://support.avg.com/SupportArticleView?urlname=What-to-do-when-I-suspect-an-undetected-file-is-infected)                
[2] (https://support.avg.com/SupportArticleView?urlname=Why-AVG-did-not-detect-a-virus)   
AVG Guru

ADEL, For removal info have you 'googled' remove BUYUNLOCKCODE.txt virus?..
No AV product is capable of providing you with 100% protection although AVG are always working 24/7.
Have a look @ these 2 articles…
[1] (https://support.avg.com/SupportArticleView?urlname=What-to-do-when-I-suspect-an-undetected-file-is-infected)                
[2] (https://support.avg.com/SupportArticleView?urlname=Why-AVG-did-not-detect-a-virus)   
AVG Guru