USB Print and Storage Center running 100% of cpu

Macbook Pro 15 in. mid '09, 10.7.4, 8GB DRAM, 500HD.

Occassionally, I get a very hot computer. Running Activity Monitor indicates that the USB Print and Storage Center is running the CPU at 100% or in the high 90s. Since I'm not printing or even using USB printing, I haven't figured out what is causing this issue. Any suggestions?