Can this computer get internet access through another type of connection (wireless, ethernet ...)?
What are you trying to download and with what download manager? Please don't say you're trying to download hardware, as that hasn't yet been invented except in science fiction.
With your T-Mobile connection please show ...
Start, Run, CMD, OK to open a command prompt:
(For Vista or 7 type
CMD in the Search box after
Start)
Type the following command:
IPCONFIG /ALL
[Note that there is no space between the slash and ALL.]
Right click in the command window and choose
Select All, then hit
Enter.
Paste the results in a message here.
If necessary use a text file and removable media to copy the results to a computer with internet access.