Auto Negotiating is selecting 10 Mbs

I am having some random auto-negotiating problems on my network. My switch and pc will sometimes agree on 10Mbs instead of 100Mbs. I have over 50 of the same dell computer models in my network and I am only having this problem on one or two machines. They all have the same drivers and same Windows 7 Enterprise image. I unistalled drivers and tried reimaging machines but still got same results. If I set the NIC to 100 Mbs it will be ok. I dont understand why it would auto negotiate to 10 Mbs randomly (doesn't happen all the time). One instance where this becomes a problem is during network image deployment when it reboots it loses my NIC setting of 100 Mbs when booting into Windows PE and as you can imagine sending a 7 to 8 gig image using 10 Mbs is too slow. In the middle of the deployment I unplugged cable and plugged back in and it went back to 100 Mbs. I tested cable and tried replacing cable with same result. We are using Cisco 10/100 switches and I know you can set it too 100 Mbs there but I would rather fix the problem than change settings to the port, like I said its fine elsewhere should be here to. The lights on switch are normal and I don't see any occurances of collisions or a bad port. Any Ideas?  
cmartineauAsked:
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enachemcCommented:
try using other computer's cable
cmartineauAuthor Commented:
I did try another cable and the distance from the switch is not but 30 to 40 feet. I am getting both 100 and 10 Mbs with current cable. Just really weird never seen this problem before, would there be any useful information in the log file on switch?
OLY8892Commented:
Have you tried changing the NIC on the machine with the issue with a know working NIC?  It could just be the NIC is having problem Auto Negotiating.  Test and see.

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kuohCommented:
I have seen this occur with NICs, especially integrated ones, shortly before they go out completely.  Sometimes they negotiate a lower speed, other times, you get normal speed but intermittent data connectivity even though the link indicator shows connected.  As the others have suggested, trying a second NIC or relocating to a known working jack would be a good starting point toward identifying whether the problem originates with the PC, cabling or switch.

KuoH
cmartineauAuthor Commented:
That would make since about the NIC auto to 10 Mbs before it completely goes, I will try to install a good nic and continue from there, thanks for your help!
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