98 sees XP/XPdoes not see 98

Small Network. Comp.”A”is W-XP, Comp.”B”is W98, Comp.”C”is W98. Comp”A”can see Comp.”B”without any problem. Comp”A” cannot see Comp.”C”. Comp”B” & “C” can both see and access Comp.”A”.
I have set the tcp/ip addresses so they are on the same network. I have Shared the Printer On Comp.”A” and it is working fine. COmp”A” is the main file holder and needs to see Comp.”C”. I cannot figure where I have gone astray. Please email if this is not clear I will send My LL#.