Thanks so much for adding the screen dumps.
You have to associate a Cisco 3725 image with the Cisco Ethernet Switch - in fact it is not really a switch at all, just the router that most closely functions as a switch using the MIPS processor (which is all GNS3/dynamips can emulate)
So from your picture, I can see that all of the images you have added are mismatched - your c2960-lanbase......bin image is useless - so too is your c3750......bin, your c3550..........bin your c2600 and your c3750-adv......bin
None of the images you have is a MIPS based image.
Read
http://www.gns3.net/hardware-emulated/ to see which router models are supported, and make suer you ONLY use images that suit these models
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RedNectarhttp://rednectar.net@rednectarchrisGNS3 WorkBench-a VMware image of Ubuntu with GNS3 and VPCS installed and a collection of exercises/labs