Since we started using Windows 7 at work we started noticing that network shares would have a red cross icon after booting. This caused some problems with programs that relied on these network drives. If a user clicked on the mapped drive it would become instantly available. After doing quite a bit of research we found that Win 7 wasn't the only culprit. At the time we started using Win 7 we also updated or network infrastructure from 3com to Cisco. Both 3com and Cisco had spanning tree configured, but with Cisco we had to turn on spanning-tree portfast. Once portfast was turned on, the red cross problem was gone. Spanning-tree portfast allows the port to which the client pc is patched to come up faster. I would advice to also turn on BPDU guard when turning on portfast.
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