Download "Windows 0.73 Win32 installer" from http://www.dosbox.com/download.php?main=1
Run the installer. Accept everything.
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Next important step: create a folder to use as virtual C:\ in dosbox.
Open 'computer', browse to c:\ and create a new folder named oldgames
So you have: c:\oldgames\ in Windows.
Now open your start menu, open dosbox menu items, open configuration,
click on edit configuration, will open your dosbox 0.73 config file in notepad.
*If you want multiple personalised conf files read the dosbox readme to know how to proceed, but for most users the default config file will do fine*
Scroll the whole way down to header [autoexec] and add:
mount c c:\oldgames
c:
Save and exit.
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Run dosbox now, if you did it all correctly dosbox will start up with a C:\ prompt ready.
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If you have a partitioned harddisk, you also simply can create an 'oldgames' folder on your D: partition (or E: F: ...).
Adapt your mount lines accordingly.