SNMP query for Windows Partition w/ no drive letter

Nagios Nagios Plugins support
1

I am trying to query a windows partition on our Exchange servers that doesnt use a drive letter.
I have walked the OID and can get a response
SNMP OK - “E:\Database\Archive” “E:\Database\TempStore” (the drive letter is actually a mount point here)
but I am having troubles using the -w -c variables …

./check_snmp -H ip_address of host -o 1.3.6.1.4.1.9600.1.1.1.1.1.19.69.58.92.68.9.92.65.114.99.104.105.118.101,1.3.6.1.4.1.9600.1.1.1.1.1.21.69.58.92.68.97.116.97.98.97.115.101.92.84.101.109.112.83.116.111.114.101 -C snmp_string_here -w 80:90 -c 90:90
No valid data returned
any help?
Thanks

2

also tried
./check_snmp -H 10.x.x.x -o 1.3.6.1.4.1.9600.1.1.1.1.1.19.69.58.92.68.97.116.97.98.97.115.101.92.65.114.99.104.105.118.101 -C xxxxx -w 80 -c 90
No valid data returned