Least frills?

d:\>du -h sqldata 
743M    sqldata/MSSQL/Data
65K     sqldata/MSSQL/LOG
0       sqldata/MSSQL/JOBS
0       sqldata/MSSQL/BACKUP
0       sqldata/MSSQL/REPLDATA/FTP
0       sqldata/MSSQL/REPLDATA
743M    sqldata/MSSQL
743M    sqldata
[download]

This gives you more than you ask for, but it is not much of a stretch to grep however you want.

You can get a win32 version of du from this GNU project on sourceforge.