aspire 4720z wireless card issues

hello all
this is my first time on the forum and im hoping you guys can help me get this going..its my buddys laptop that i reloaded since he got a big virus and could not get it removed. i got everything reloaded but naturally he lost all discs that came with the damn thing so i dug up my vista home premium disc since thats what he had. i got everything reinstalled and everything works but the darn wireless card i tried using all three wireless drivers they show on the acer website for this laptop and none of them worked so after many hours i found out that if you click show all then it showed and extra one for the broadcom so i installed it and then under device manager it started showing that the wireless card was under network adapters so i tried hooking up wiress and its like i dont have a wireless card install, also my red light underneath the wireless button is flashing red and i can turn it on and off with the button but it doesnt enable or disable it just shuts the light off. so i got my dell laptop out and put it next to this acer and my laptop found my wireless with full signal strenght and was surfin the net. the wired connections works wonderfully tho. anyhow i went to network and sharing center and clicked on manage network connections and it shows the broadcom wireless network connection but it wont enable it says its enabling then its enabled but below it still shows disabled so i clicked on the dignose deal and it says the device is experience hardware/driver problems but its the only darn driver i can find that evens recognizes the wireless card... he needs his wireless fixed by monday since hes startin college back up and he takes it to school with him to use for notes and pull items off the teachers server that he uploads...thanks in advance for the help and sorry about the long post but figured it was best just to tell ya what ived done already

thanks for all the help i have tried everything you guys have told me to do and its still not working i did put kapersky internet security on it for him since i had one extra key becuase it was cheaper to buy 3 than two.. does anyone have any other suggestions??????? im bout to tell him to sell his truck and buy a differnt laptop haha

yes i have tried them all and i ran that aspire 32 i think it was called that tells you everything about the hardware in your computer and i even downloaded the broadcom driver the card that it says it is and it just will not work...i even tried forcing it to load that specifick driver and still will not enable the darn wireless.....

thanks for the help everyone but i got it figured out...im using it right now it was kaspersky messing with me uninstalled kapersky then it started working and reeinstalled kaspersky now everything is good and secured...thanks very much everyone.

i put kaspersky internet suit on it its got a really good virus deal with a bunch of security stuff the only thing is you install it after you get all your hardware loaded otherwise it senses the network settings and locks everything else out so that it dont get attacked install it after all hardware and you wont have an issue....its the only program that got my dads computer/network cleaned up after my brother braught home an external hdd with a nasty virus on it that one of his fellow soldiers had put on it.....just goes to show never loan your computer equipment to anyone cuz they will mess it up happens everytime.......
thanks for all the help guys glad to have that piece of junk out of my house