Hi there, I'm not sure if this is the right place to post this so tell me if I'm in the wrong place!

Having a bit of trouble setting up a LAN netowrk of 2 PCs:

1's a Dell P3 866Mhz, 320 RAM, WinME
The other's a Toshiba P1 200Mhz MMX, 48 RAM, Win98

They both have the exact same network cards (bought the other day) installed without a problem and have the correct cable going across (crossover cable I think it's called). The issue is that although they'll recognise that each other are there (the diff PCs come up as diff icons in Network Neighbourhood), they won't talk to each other (Can't access/see each other). I tried to ping each other using their respective IPs (found using ipconfig) with no success. They can ping themselves no probs which I think shows the cards are working! The lights on the back of the cards work & flash the odd time but are constantly on. Here's the wierd part:

I tried to play Command & Conquer Tiberian Sun with them & they see each other's names (individual/multiplayer names); the faster one (Dell) can send messages to the Toshiba and the Toshiba receives them ok. When the Tosh tries to send one back, the Dell never gets it. If I create a game with the Dell, it shows up on the Toshiba, but when the Toshiba tries to join, nothing happens. When the Toshiba Hosts a game, it disappears off the list of players on the Dell & won't come up as a game, unlike when the Dell does the same! I'm ssoooooooooooooooo confused!!!
What's going on & can someone please help! It's been wrecking my head for days now! Even tried different OSs & other games & still doesn't work!

Thanks for any help in advance!

JP