I think you bought a combination DVD/VCR, which allows you to play and watch both VHS tapes and DVD disks. But usually with these combos, you can only do VCR recordings, not DVD.
I am not sure what you mean "VHS tapes are blocked". Do you mean that some DVD's are protected and you can't play the DVD and record it on VCR?
I am not sure what you mean "VHS tapes are blocked". Do you mean that some DVD's are protected and you can't play the DVD and record it on VCR?