Hello,
I describe my problem and please help me.

I install Dude 3.6 on my RB750 Mikrotik and use win7 as client to connect it . It work perfectly. Unfortunately I uncheck remote access to my server and cannot connnecting now. I try everything
1. Uninstall Dude package from MT, and re-install
2. Uninstall Dude client from PC and re-install
3. Hard reset my MT and install Dude again.
It doesn't take effects.
How can I reset configuration on mikrotik or remove it definitely?

Change the allowed network to something like 192.168.0.0/16 then if it starts working change it back to 0.0.0.0/0 if you need to.