Usually I would recommend to try a Linux Live CD. This is an operating system that can be started right from the CD without being installed to your hard drive or changing it in another way. But since the Ui 3520 has no CD drive, this is not an option. But a Live Linux can easily be transfered to a USB key or SD card. All you need for this is a program like
Unetbootin and a USB key or SD card that is big enough to hold the image of the Live Linux. Unetbootin has a list of Linux distributions to chose from, which will be downloaded automatically. But nearly every other distribution can be installed if you download it in advance.
Depending on the size of your USB key and the speed of your internet connection I would recommend
Linux Mint 8 (688MB, has to be downloaded manually) or
Ubuntu 9.10 (690MB, in the Unetbootin list) if you have a key of at least 1GB. If you have a smaller USB key, try
Slax (200MB, Unetbootin list) or
SliTaz (30MB, Unetbootin list).
After applying Unetbootin you will have a bootable Linux Live USB key or SD card from which you can boot your netbook to test your sound card or do other things.