Drive with the same letter exists

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Startings win-sshfs as administrator
2. Provide key authentification with passphrase
3. Mount the drive with any letters

What is the expected output? What do you see instead?
I expect that win-sshfs mount a point access to my server but all letters seems 
to be used even though they are all available in windows.

What version of the product are you using?

win-sshfs: 0.0.1.5
Client OS: Windows 7
Server OS: Ubuntu-server 14.04 LTS
Ssh server: openssh


Please provide any additional information below.

Dokan library : 0.6.0.0
SSH.NET 0.1.0.0

Trying the same configuration as a user (and not admin) return "user 
authentification method is not supported". Everything is working great on any 
comp running linux.

Original issue reported on code.google.com by [email protected] on 7 Jan 2015 at 10:46