I use a Lenovo ideapad Z570. A few weeks back my bios was broken and I couldn't get into setup or boot options, so I temporarily installed a version of windows to update the bios (this is the new bios I downloaded: http://support.lenovo.com/en_US/downloads/default.page?). Then I uninstalled windows and went back to Ubuntu. The bios works fine now, but ever since the update my computer randomly freezes like every 10 minutes (even when I have no windows open), and all I can do is move the pointer. I also get a bunch of "system program problem detected" errors now. Reinstalling the OS doesn't help.
Thanks a lot,