I'm still testing the waters in regards to digital recording, but may be able to offer some suggestions.

First, my L6 UX2 came bundled with Ableton Live Lite software.  I've gotten free upgrades to my software several times right up to current day.  I believe the newest version of that software is Version 8.0.10  I've recorded into Ableton using both my PODxt bean and my UX2 with no issues whatsoever.  It seems to be a very intuitive program from the standpoint of recording tracks and using various VST plug-ins.  If you didn't get the Ableton software bundled with your UX2, I believe they have a demo version you can try on their website.  Their new "entry" version recording software is called "Live Intro", and I think you can get into it for around $100 US.  Here's a link to the Ableton site:

http://www.ableton.com/products

If by chance you did get the Ableton software and for whatever reason didn't like it, you may disregard.

Next, if you're already using XT live hardware, I don't believe you need to go through the UX2 to get your signal into your computer.  Both devices have USB inputs which allows your to record directly into the PC via the USB input.  When I record using my PODxt bean, I go via USB into my laptop.  With Ableton open, I select the ASIO driver and then the PODxt as my input device.  Arm the track, set your input and recording levels, and hit record.

I also record into Ableton using various plug-ins and amp modeling software programs.  I used to get a lot of drop-outs with VST plug-ins like Amplitube and GTR Solo when using my UX2 and the provided L6 drivers.  I eliminated this problem by switching to the ASIO4ALL driver when I use these plug-ins to record with in Ableton. With my PODxt, UX2, and POD Farm, the L6 ASIO drivers have worked perfectly with no latency issues whatsoever.  Your results may vary depending on your computer's processor speed, amt. of available RAM, USB type, and knowledge of your OS and device drivers.

As the other poster noted, there are a lot of shareware recording programs out there that you could also try.  Reaper and Audacity are the two that I've used, and both are good performers with an average learning curve.  I've also tried Mackie Tracktion but didn't like it.

If you're having difficulty trying to learn a new software recording program, or are not comfortable tweaking settings and / or adjusting your PC to work with computer-based DAW's, maybe you should consider getting a portable DAW.  Tascam, Zoom, and Fostex have some nice portable 8-track digital recording units priced in the $249 - $300 range, all with a pretty impressive list of features.  Most (or all) will have various send and mastering effects, allowing you to record, edit, and master your tracks all on one device.  These devices will usually have one / several line-level inputs thereby allowing you to run your signal from your XT Live devices directly into the DAW (*via 1/4" cable).

Anyways - I hope this helps.  Good luck with your recording project.