I agree with the plastic but wouldnt waste my money on it before making sure of the following.
1) Make sure the gutters are not clogged
2) make sure downspouts extend out at least four feet
3) make sure all the ground slopes away from the house (including behind shrubs)
If you do all of these things you may not need the plastic at all.
Brian
http://www.handyguyspodcast.com