"Connection Failed" when trying to access TC that I have already connect to

Hello,
I have been connecting to my office network for well over a month now with no problems. Now, no matter what I do, i can not connect to the Time Capsule that provides the WiFi for the office.
The Office Network appears in the Airport drop-down list and I can select it to connect to it. However, even though I enter the password in correctly, it continually says "connection failed."
The other computers (all Macs) can connect/stay connected just fine. I have tried restarting both my computer and the entire office network several times to no avail. I have updated all software on my computer. I have removed the network from my list of preferred networks, tried to connect to it again, and I have manually "Join Other Network" all to no avail.
The same thing happened about 2 weeks ago. Just randomly, after about 3 hours of no connection, it allowed me to connect again. I can connect just fine to any other Wireless Network--Starbucks, my home Aiport Express, Apple Stores, etc... I am limited in what I can do to the Time Capsule, seeing as how it is the Office's and I am not authorized to get onto Airport Utility/change settings on the TC.
I am at my wits' end with this one.
My computer:
1.83GHz Macbook Pro
1GB RAM
80GB Hard Drive
Airport Extreme (0x168C, 0x86)
Wireless Card Firmware Version: 1.4.3.1
The Wireless Setup:
Comcast cable modem, connected to 1TB Time Capsule with latest firmware/software updates.
Thank you for any suggestions.

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