Can I query NIC link speed?

Greetings,

Is there a way to query NIC link speed using LANDesk agent?

We have just recently upgraded the physical network wiring in our environment.  Some of the WinXP boxes were hard set to 10 Mbps half.  I would like to find out if there is a way for me to identify these boxes and perhaps use a powershell script to change them to 1 Gbps full or Auto.

Thanks in advance!