You forgot to specify D drive as CD-ROM drive.
And besides you probably don't want to run the game directly from cd, but from the folder you installed it into (C drive).
mount C "c:\Documents and Settings\win\Mes documents\DOSBOX Stuff"
mount D "c:\tanks" -t cdrom
c:
cd tanks
tanks.exe
Assuming c:\Documents and Settings\win\Mes documents\DOSBOX Stuff is where you will install all your DOSBox stuff -> C: Drive
Assuming c:\tanks contains all files from cd-rom.
Assuming you have the game already installed to C:\TANKS (DOSBox see it that way, real path is c:\Documents and Settings\win\Mes documents\DOSBOX Stuff\tanks
The real C:\TANKS path is seen by DOSBox as D drive (CD-ROM, we mounted it that way, remember?)
Well, keep asking if you don't understand something but read the readme file that came with DOSBox first and the GUIDES section on this forum should prove useful too.
If you are still stuck, you should consider using a Front-End.
Intel i7 5960X
Gigabye GA-X99-Gaming 5
8 GB DDR4 (2100)
8 GB GeForce GTX 1070 G1 Gaming (Gigabyte)