Serious hard drive problem

I've encountered another problem. For some reason photorec won't let me navigate to the base directory, where I want to select my external hard drive as the storage for the recovered files. I've tried the left arrow button and double dots, which let me navigate there when I used it on my other laptops. It's the same with both the integrated knoppix version, and the newest version I downloaded off the site. What gives?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Asus
OS
Windows 7 64 bit
Graphics Card(s)
AMD Radeon HD 5790
Antivirus
Windows Defender
Browser
Chrome Canary, Firefox Nightly
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