Sheet vinyl flooring as amoisture barrier.(a concrete floor has high moisture levels)Can you lay sheet vinyl over the concrete.Letting the vinyl and adhesive cure and stick to the concrete,then lay gluedown hardwood over the vinyl?

What about it?

I am assuming your intent is to lay a hardwood floor over an existing vinyl floor.
Ignoring all other issues, and answering the question, yes it will suffice.

You should make sure the vinyl is not so strong that it deflects the nail as it penetrates. I have had this happen.
If the vinyl is only edge glued, I would remove it anyway, not a big job.
Dont forget to re-fasten through the vinyl, the underlayment and subfloor, to eliminate any existing squeaks.

Seems like this question has changed since it was posted.
I dont understand why you would INSTALL vinyl flooring as a moisture barrier when there are lots of products designed for this purpose.
Initially your question seemed to indicate that the vinyl was already in place. I retract my agreement that this would suffice.
Most important in this case is to determine WHY the concrete has a high MC, and try to alleviate this problem. Then use a product such as MVP from Bostik or some other moisture barrier designed to isolate the concrete from the finished floor.

Actually, a few flooring manufacturers RECOMMEND this in cases of higher MC in concrete. Of course, the adhesive used to adhere the vinyl to the concrete needs to be somewhat "water proof" as well. In fact, I have used vinyl over concrete and under wood in quite a few scenarios PRIOR to products like MVP. But today, it is less money and faster to simply apply MVP or similar.

Thanks for the reply.Im aware of Bostiks MVP ,but I had a roll of vinyl that would suffice.My question was ,CAN you use sheet vinyl in lieu of other moisture barriers?

Yes

Yes!

Sheet vinyl has a very high perm rating. It is the seams of the sheet vinyl that need to be addressed.

Bruce/Armstrong, still have sheet vinyl as an acceptable moisture barrier, over concrete.

The deal is, the bond of the sheet vinyl to the concrete. If it does let go, you have a floating floor in that area, and unless it is buckling, it is still a livable floor.