Ok, that was my suggestions:
1st use : Terro Ant Killer II to bait the invading colonies, eliminate the
queen. Get it from Lowe's, remember to bait often, bait plenty, use more
bait station if the infestation is large. The whole process will take about
2 weeks for the ants to disappear. The guys above has the link
next use: Ortho Home Defense Spray from Homedepot. Spray all around the house,
all crevices and doorways. This will keep new colonies from coming in for 1/
2 year at a time.
Done.