What is preventing connection between Toshiba Tecra S1 with inbuilt WIFIAtheros AR5001X+ and Access Point DWL-7100AP?
any removal of a security measure will, undoubtedly, reduce your security but you are using MAC address filtering as well. this is crackable if you can clone existing MAC's. have you tried WPA instead of WEP? maybe an ASCII or HEX code in place of