“You don’t currently have permission to access this folder” – this error happens sometimes on my Windows 7 machine – seemingly in conjunction with cygwin – somehow the ownership of folders/directories gets broken.
Here’s the command to fix this quickly – run as administrator via cmd:
for /D %f in (*) do takeown /R /D Y /f %f
It loops through all directories within the current directory, and takes ownership of the folders (the /R is for recursion, the /D Y (Y will be J on German-language windowses, and the last part just specified that it concerns the folder that’s the current one in the for loop)