Macbook Pro cannot connect to the internet even when others can

Hi! Please help me. We have an internet WIFI connection in our office but only my MacBook Pro cannot connect even when I entered the correct password. My Iphone and Ipad work just fine. It says "connection timeout" but all other laptops can connect. I tried network diagnostics already and it always say "connection timeout". I dont know what to do anymore.

Yes, and when I open the Network Utility it shows a working IP address, and a 54Mb/s speed from the wireless router. It even shows the shared computers from my roomates. But when I try to access the internet it does not load anything on Safari or Firefox ( or any other internet application for that matter). It is completely unconnected. YET, As soon as I activate the AirPort card on the top right where I have my signal strength, it shows on the Network Utility information that there are 'packages' being sent and received, and I have NO programs open what so ever, I have closed everything except finder and network utility... Does this mean I am being hacked, or have some sort of Trojan or something in my computer? I ran an antivirus that my school provided, called Virex by McAfee, it came out clean except it says it cannot read one file.
I tried repairing my disk, and that did not work either. I did the Ram reset like you suggested, but that also did not work. I doubt it being a hardware error. I am going to try to connect it to an ethernet cable to see if that will work. Then I will let you know what happens with that, but that would still not be a solution since I need it wireless, cause the router is in another part of the house.
Thank you for your help, and I hope we can get this sorted out.

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My MacBook pro was perfectly active and online, in my linksys router last night before I went to sleep. I left it active as I was downloading some files, they were going awfully slow, but I didnt pay attention and left up. When I woke up today, and tried to use my computer it seemed to be kind of slow and frozen, so I forcefully shut it down and then powered it on. Everything was normal, and my airport card connects to my network, as it is supposed to do. I try to load Safari, Mail and even Firefox, but nothing works. All my other programs seem fine. I started running Virex to see if it detects anything, but I dont know what is happening.
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Yes, and when I open the Network Utility it shows a working IP address, and a 54Mb/s speed from the wireless router. It even shows the shared computers from my roomates. But when I try to access the internet it does not load anything on Safari or Firefox ( or any other internet application for that matter). It is completely unconnected. YET, As soon as I activate the AirPort card on the top right where I have my signal strength, it shows on the Network Utility information that there are 'packages' being sent and received, and I have NO programs open what so ever, I have closed everything except finder and network utility... Does this mean I am being hacked, or have some sort of Trojan or something in my computer? I ran an antivirus that my school provided, called Virex by McAfee, it came out clean except it says it cannot read one file.
I tried repairing my disk, and that did not work either. I did the Ram reset like you suggested, but that also did not work. I doubt it being a hardware error. I am going to try to connect it to an ethernet cable to see if that will work. Then I will let you know what happens with that, but that would still not be a solution since I need it wireless, cause the router is in another part of the house.
Thank you for your help, and I hope we can get this sorted out.

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I am having difficulties connecting to the wi-fi in my apartment. I was able to connect to the internet just yesterday, and it worked perfectly fine. When I try and connect to my wi-fi, there is a check mark next to the router name, however the wi-fi symbol on the top portion of my computer displays an exclamation point, stating that there is no internet connection.
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oh I'm not actually using a router, I'm using my macbook pro as a wifi router by turning on network sharing.
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...unless, of course, I'm totally misunderstanding your question @@;
I'm a complete tehcno noob =__=;

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My iPad can connect no problem but my MacBook doesn't
In settings the wifi is green and connected
The Ethernet is red
Fire wire is red
And Bluetooth is red
I tried changing from dhcp to dhcp with manual but nothing seems to work

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Go to the DNS tab
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Macbook Pro cannot connect to the internet even when others can

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