I have a DViCO Fusion Dual Express Hybrid TV card installed in my desktop computer, which is running on XP SP3. Every now & then I turn it on & it says EP45 authentication failed. I’ve tried to find out but I’ve no idea what this means, perhaps an expert might know. If I turn the pc off & on again it fixes TV, but then there is no sound (on anything, Start Up, warning beeps, Winamp,) so the only way I can fix it is to ‘System Restore’. I hope someone can enlighten me.