I'm running XoloX on Win2k Pro, AMD 1.0GHz, 256MB RAM. Never had a problem with the program crashing the O/S. The only problem I noticed was that when you exit out of the program while it's downloading/ uploading, it will generate an error. For the people who's systems it crashes, might I recommend setting up your machine properly before complaining that XoloX did something.

BTW, I'm on cable, 5.5Mbps down (average), 1Mbps up(capped), never have speed issues.