According to Tarkett's installation instructions, you should not install their flooring.
http://www.harristarkett.com/PDF_files/ ... neered.pdf
I would find the source of the moisture and eliminate that. Then if the slab still tests too high, consider Taylor's "Lock Down" moisture control sysyem.
http://www.wftaylor.com/key_products.php
OR Franklin's 531 and 811 system
http://www.franklinflooring.com/Determi ... sNewFF.asp
You probably won't be able to get these products at HD or Lowe's. Go to a flooring distributor near you or order online.