deny DHCPINFORM?

[easyxpress]

In the /var/log/messages of my Fedora Core 1 server running DHCP, I saw one of the clients keep issuing DHCPINFORM to the server. I actually don't know why the client PC does that, may be it got infected by viruses or something. Is there anyway to configure the server to deny this DNCPINFORM request? It is clogging up the log files in the server.

From /var/log/messages
Sep 8 21:53:55 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 21:53:55 Snowmass dhcpd: DHCPACK to 10.90.241.125
Sep 8 21:53:59 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 21:53:59 Snowmass dhcpd: DHCPACK to 10.90.241.125
Sep 8 21:56:27 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 21:56:27 Snowmass dhcpd: DHCPACK to 10.90.241.125
Sep 8 21:56:31 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 21:56:31 Snowmass dhcpd: DHCPACK to 10.90.241.125
Sep 8 21:58:40 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 21:58:40 Snowmass dhcpd: DHCPACK to 10.90.241.125
Sep 8 21:58:43 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 21:58:43 Snowmass dhcpd: DHCPACK to 10.90.241.125
Sep 8 22:00:51 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 22:00:51 Snowmass dhcpd: DHCPACK to 10.90.241.125
Sep 8 22:00:55 Snowmass dhcpd: DHCPINFORM from 10.90.241.125 via eth1
Sep 8 22:00:55 Snowmass dhcpd: DHCPACK to 10.90.241.125

[Jman]

What exactly is the client running?

[easyxpress]

The client is running Windows XP.