I have been using limewire for a number of years now and have never had a problem using it on Windows XP Media Centre Edition. I just bought a brand new Dell XPS with vista ultimate 64bit. I try to connect and it just stays on "trying to connect". No error messages come up, i can leave it for a day and all that it will read is trying to connect. Help??

I presume you just updated to lw 5?
Make sure both LW's are NOT using the same connection or listening ports. Change the LW on Vista to another port. Can be found via Tools -> Options -> Superduperdadvanced -> Firewalls if using LW 5, else if it's LW 4, Tools > Options > Advanced > Firewalls.

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I installed LW 5, all works well now, thanks!!