Well two other options.
It
oculd be possible using img burn to decrypt the disc onto your harddrive. Decrypting it may override the error as it can take as many tries as it likes to get it onto your hard disc.
I bought a Simpsons series boxset once and one of the discs locked and I was able to decrypt it this way and it worked fine once burned off again.
The other option is just downloading the film off the net.
If the film is this 1974 Frightmare you can download it here.
HORROR HOUSE: Frightmare (1974)
If you don't have a rapidshare account just pm me and I'll give you my login details so you can download it.
If you have a decent speed broadband it should only take about 20 minutes.
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