My Vista stopped working due to signature problem with sptd.sys. Â This is part of Daemon Tools having to do with virtual drives. Â As Ultra ISO supports virtual drives I speculate this may be the program that installed the bad driver, (I have an older version of Ultra Iso)
?? - Did Ultra ISO install the sptd.sys driver?
?? - Is there a newer sptd.sys with proper signature that won't crash Vista?
I have the sptd.sys driver turned off right now and Vista 64 is back to booting..