Wired Internet Suddenly Not Connecting?

For whatever reason, as of Tuesday afternoon my laptop can no longer connect to wired internet. I am a college student (NYU), so I cannot access a modem or router myself. I have tried:

-Plugging my cord into another jack in my dorm room

-Using my roommate's ethernet cord

-Taking my cord and laptop to different areas on campus (library, other dorms, etc) that use different wired networks, and attempted connection there Worth noting is that I can still connect to wireless internet just fine (however, my dorm does not have wireless, making things very difficult for me).My ethernet adapter is a Realtek PCIe GBE Family Controller. It was just updated today, in hopes that maybe it was a driver issue (Prior, it was a Realtek 8168C/8111C, whatever that means). All drivers have green checks next to them and appear to be working. Here is my IPConfig info:

Description : Realtek PCIe GBE Family Controller
Physical Address : 00-1E-EC-55-91-1F
DHCP Enabled : Yes
Autoconfiguration Enabled : Yes
Autoconfiguration IP Address : 169.254.26.193
Subnet Mask : 255.255.0.0
Default Gateway : (blank)

I am running Windows XP Service Pack 3. My laptop is a custom-built CyberPower PC. I have done a Malwarebytes Scan,SuperAntiSpyware Scan, and Avast Anti-Virus scan, and have turned up no malware or viruses.