suggest free anti-ransomware

You are not gonna get infected with ransomware if you are a carefull user. Also for me, a simple user is stupid to use antiransomware unless you are want to get infected.
its ok
I think someone else will answer what I asked
 
appcheck antiransomware and kaspersky antiransomware tool are the 2 ARs I recommend because of their effectiveness and stability
ransomoff is the strongest free AR but it may cause some problems if you don't mind
 
You can also try 360 Document Protector the Ransomware Terminator.
Although it does protect the Documents well (and is interesting as the backup process only initiates when malware tries to screw with the doc's) and all encrypted stuff can be restored, note that this application is ONLY for the Document folder so will have less utility and is certainly less mature than the Backup/Restore solutions promoted by AppCheck and RanStop.
Some more details at this thread regarding efficacy and extensions, for people interested in trying the app.
 
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