[suse-security] LAN Problems

Hi I don't know whether this actually is a security problem, but when connecting from my Linux-Laptop to my Windows 98SE Desktop, file transfer rate is extremely low, only about 20kb/s. When I connect the same machines from win2k (dual-boot on laptop), I can use the full 100Mbit. What could be wrong? I installed harden-suse, does it have something to do with this? Thanks for any help! Cheers Markus