how do u switch from 10m bps to 100 mbps

if you have 10/100 mbps lan card if you want to change data transfer rate from 10 to 100mbps or vice versa just do the following .
1) right click my network places
2) select the properties
3) right click the local lan connection and select the properties
4) opening the local area connection properties in the general tab there is configure option.
5) you get the fast ethernet adapter properties
6) in the advanced option there is a value field
7) default value is auto_config but you can change it to

10 mbps half duplex
10 mbps full duplex
100 mbps half duplex
100 mbps full duplex