For Q3, the company sees comp store sales down 5%-10%, with profits of 28-36 cents a share, below the Street at 41 cents.

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The company said it now sees Q4 comp stores down 4% to 7%, with full year comp store sales off between 7.5% and 9%.

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The company also saw a mid single-digit comp store sales decline in mobile computing due to a fall off notebook computer sales, in part reflecting a pick-up in tablet computer sales.

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The company said it now expects to report Q4 and full year comp store sales down 1%-2%.

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Year-over-year comp sales declines in the low to mid-teens can be withstood for a while, but the company can't have too many more 26% drops without a liquidity crisis.

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Some retail experts say that a mature company such as Wal-Mart, with over 3, 200 stores, is bound to see its comp store sales slow down as it builds multiple locations in many markets.

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