I was coming across the same issue in windows 10 but updating the environment variable following the given steps below, it tends to be working fine.
I know It is a lengthy answer for the simple environment setups, I thought it may be useful for the new window 10 users. Please follow the steps below:-
1) Open Anaconda Prompt:
![enter image description here](https://lh3.googleusercontent.com/bz8QJqxLnmFuzAMGFXkzNiCFHMvmO_mhdLyYhsdHL-hdql1WodgDB5j_KeYf3rOPT3Nq4RCqJfN6Gc2nSRkCUsXyQG_r6HYZS-AeWWUFumhLhm5zQ87l_-AH-mGwVveMwXlMaRpj)
2) Check Conda Installed Location.
where conda
![enter image description here](https://lh6.googleusercontent.com/BDKXToeiIN_mbx76ToaruidxxOkANVkYpJcT1_8Y9IR-LugvMOXH-cG9XxhD98vfOYXbwkSGRCSb42PmDnOxY5ft6Q1yz5oEBub06p8RDROedZ4xclbBqoxqS2F0EOYS4OoEuELn)
3) Open Advanced System Settings
![enter image description here](https://lh6.googleusercontent.com/9nt2cUfDg9b53VEq_OodZzyXDYtbfVHzX_8mesyqdcfJ8288HLO4wPV2cimDysLcrGDfDnXuT003-5TY7bf9Fn8bp5v266w1caljl4p8vlJ0JjAN2mgDkp7dDq0YQgjpjMWc4VF_)
4) Click on Environment Variables
![enter image description here](https://lh3.googleusercontent.com/sckBH4IfM2iSeAmAuf7zUVaD-vYjhtNTExyGfvq4POBbrgzWFF9Wti6ACJv7CS2gyy3A3TVbIEOtMvvHBZHdhJ2LzSBobKvH-rfakMKGen0S33r-2wShkkADIrtj53laGC0VF60t)
5) Edit Path
![enter image description here](https://lh4.googleusercontent.com/t3kbqozQqYK-akblsH91x0EC25go-AXn5_GaMVMSH5O315j96UfT5XKVkayixn2l6VmtScv-tq69o5T44eMXJ__u87wIbqRPMCMA8VsWXj9WbwJ8jhCOVfUAtJJ62eBbo2yBH7-o)
6) Add New Path
C:\Users\RajaRama\Anaconda3\Scripts C:\Users\RajaRama\Anaconda3 C:\Users\RajaRama\Anaconda3\Library\bin
![enter image description here](https://lh6.googleusercontent.com/KCKEvJOcPJpryJiwKsXuJ4uZT7Huw0DwXfi1BZ7nVp0SPE1_VSNhYNxXpCI3762tExYyBRIMhBJq62481H6wt68ScWGFeSjjns48GuXHIJ7ErWRz-UT5-FL80zx59GpajrQsMUCn)
7) Open Command Prompt and Check Versions
8) After 7th step type conda install anaconda-navigator in cmd then press y
![enter image description here](https://lh3.googleusercontent.com/jEI5BFSoJjJpineX0if_Wk-ZtTa8jPR0OZQNwWlBQQAqXwOH9LGgeL39nwwtQpuyKIcKNLu6rfM0jmzyx_vfxNTZXMYenDgK2EKYimpBSTcVQN4cQP2jidel7Wz6f6ZvNe6sYfeJ)