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The IP range of most routers is, as said by SLM 192.169.0.xxx It will vary from manufacturer to manufacturer.
A clue as to it's range will be the admin logon IP addy you can put into internet exploere to administer the access point's settings, may be details in the user manual. If the admin logon is say 192.168.0.100 then give your PC an IP of 192.168.0.150 (only change the last three digits to anything other than the access point's IP).
To get your internet connection to work, you will also have to set the "gateway" IP in the TCP/IP properties of the computer card. Normally you point that at the IP of the access point.
If you continue to have difficulties, please post the full model number of your 3Com device, so we can look it up.