Try this (at home):
Download and install a different browser than the one you are using now.
Firefox, Opera and Netscape come to mind. Don't go to the site yet.
In Control Panel, under Users, temporarily create a new User account with a different name and logon to this account.
The following only works without a router - using a direct
computer to modem/gateway connection.
Turn off your modem (cable - broadband - DSL) and turn back
on.
Click Start, Run then type CMD and click OK
type:
ipconfig /all - Note your IP address (may be more than one)
type:
ipconfig /release
Wait for all zeros to appear
then type:
ipconfig /renew
Then finally:
ipconfig /all
and see if your public IP address has changed.
Open your newly installed browser and see if you now have access and behave normally.
Another option may be to use a public (library) computer or
cybercafe with a different windows logon on your mobile laptop.
If you are behind a router, they cannot see your hard ethernet address (the MAC address mentioned above), only the public IP provided by your ISP. They could be banning a subset of IP addresses - virtually banning you along with others on your work network as well as neighbors in your broadband node at home.
Good Luck with the b
rds