You should not have used paint. Paint does not bond to concrete, even if it is preped. If your paint is lifting off the slab then the moisture is in the slab, you need to try and find out if you have a vapor barrier under your slab, if so then scrape all the paint off and etch with muratic acid and let air dry (using fans and window or door ventilation) 4 DAYS!!!! Then do the (re:by j-j-) metioned moisture test, If it draws out more moisture continue to let air dry till it stops.( You may need some heat, like a torch or just crank up the furnace) If there is no vapor barrier then do everything above and check to see if you have good drainage around outside of basement. Is the paint crinkled on top? If so then there is moisture in the air and you should keep the air moving down there.
Goto Porter Paints and get a waterbourne epoxy, prime,topcoat, and never see paint peel again.
Waterbourne epoxy's let the slab breath and wear alot better than paints. Since paints do not penetrate into the concrete they can never bond except by gravity, so always use epoxy for concrete not paint.