Default [Q] Odin not working (succeed 0 / failed 0)

Okay so was needing to flash the stock rom back onto my Galaxy Ace GT-S5830i as CWM could not mount /data, /system, /cache or usb and therefore I couldn't install any roms. I have managed to get my phone into download mode, I plugged it into my PC (I believe I have the latest drivers - no kies) but that brought up the device not recognised error on my PC. I decided to ignore this and carry on. I load up Odin3 v3.07 and put the stock md5 into the pda section. This is the output I get:
Code:
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> PDA_S5830i_XXLI1.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
I then proceed to press the start button and nothing changes other than I recieve this message:
Code:
<OSM> All threads completed. (succeed 0 / failed 0)
I try again and get the same again. Tried rebooting into download mode again and it's still the same.
What can I do? What could be causing this?
Thanks in advance, Kyle.