I keep losing the OSS & have to re-activate it from the Cd. Its installed on a computer I built about 8 months ago & was ok til about a month ago. its got xppro, vista 64 & 4 installs on linux on it plus dos. I 1st saw an 'error3', reinstalled oss & ok. A couple days later I see non-system disk, again reinstall & ok, couple days later it froze on bootup, reinstalled oss from cd & ok. Today I see nonsystem disk again, when I press key it goes to xp/vista boot menu & boots ok. I dont use this machine every day, I use it mostly for video editing/dvd burning in XPpro. It seems to act up every other day or so.