Hotmail Email can’t open at office

I am using windows 2000 with admin right as a user. I am facing a problem from the last few days that when i signin to my hotmail account and want to check my email all the pages open correctly but the page with inbox email and mail is not active ot not working. I am using internet explorer 5 and i have also reinstall it again but problem does not solve. I have also used opera but same problem exist there also. Please tell me how can i check my mail in my office as all other my collegeas can check their mail normally but i can’t check my mail.
Thanks in advanced