I tripped and ripped headset cord out of usb port leaving plug in

You have to set your headset as default under your computer settings as well as adobe flash player setting. You can find the fix at Questions Rosetta Stone Community

hi.
see if this link helps you out.
Rosetta Stone Version 4 Italiano Level 1 5 Set installation aborted setup...

Open the plug case by prying it apart.
The tiny circuit board is labelled on one side - three connectors for the headset and two for the microphone.
G - headset ground - red/gold wire
R - headset right - blue wire
L - heasdet left - red wire

M+ - microphone + - green wire
M- - microphone - gold wire.

Use hot soldering iron to 'melt' off the tip of the wire coating and apply tiny amount of solder. Place wire in position and solder together.

Finally use electircal tape to hold the plug covers together and continue to tape along the cable so it will not pull out again.

This worked for me:

1) Right click on the Rosetta Stone icon in the Start menu
2) Click the "Compatibility" tab
3) Set it to run in compatibility mode with Windows Vista SP2 (mine was defaulted to run in XP compatibility mode, which seemed to be the problem)
4) Start the program again, if you are lucky all mics will now show up

Check out your Mic settings in Rosetta Stone, here are some detailed instructions in a form of a PDF file:
http://www.rosettastone.co.jp/common/doc/RWV3_QS_Headset_English_%28US%29.pdf

I have finally found a solution! I found it by chance on the rosetta stone troubleshooting page. I have nod 3 antivirus + firewall and in the firewall settings the rosetta stone application was blocked (it was denied internet access). I just deleted it from the list and the next time rosetta stone asked for internet access I clicked yes. Now rosetta stone detects both my dynamic microphone and my usb headset and it works fine. Hope this works for everybody.

I have finally found a solution! I found it by chance on the rosetta stone troubleshooting page. I have nod 3 antivirus + firewall and in the firewall settings the rosetta stone application was blocked (it was denied internet access). I just deleted it from the list and the next time rosetta stone asked for internet access I clicked yes. Now rosetta stone detects both my dynamic microphone and my usb headset and it works fine. Hope this works for everybody.

I found the answer. Rosetta Stone has a problem detecting the mics if the speaker input is not in someway connected to the mic. I'm not exactly sure how it works, but I don't care and neither should you.

Follow these steps each time you want to use it and you should be fine.
*I'm on Vista, but this should work for every one.
1. Open Control Panel
2. Open Hardware and Sound
3.Open Sound
4.Set Line 1 as your Default Speaker
5. Refresh the Mic list
*All of your mics should now show up.
6. In Rosetta Stone, apply the mic you want and finish the setup.
7.Start whatever language you're using and switch back to the Sound menu.
8.Set whatever speaker you want to use as default.
*Rosetta Stone will continue to work fine until you close it, switch Users, or remove the mic.

In short you have to set the default speaker to LINE 1 to get the mics to appear. Then when you apply the settings switch the default speaker back.