cdin your question is invalid
CD:\isn't a valid directory in Windows.
CD:would indicate a drive, except that drives are restricted to a single letter between
\MYSQL\BINis on drive
C:, then your commands need to be:
C:\>cd \MYSQL\Bin C:\MYSQL\Bin>mysql -u root -p admin -
If you're not already on
C:(which you'll know by looking at the prompt in the cmd window), or your MySQL folder is on another drive (for instance,
D:), change to that drive too:
C:\> cd /d D:\MYSQL\Bin D:\MYSQL\Bin>mysql -u root -p admin -
mysqlis optional, since
.exeis an executable extension on Windows. If you type
mysql, Windows will automatically look for an executable file with that name and run it if it finds it.