I think the tech support is pulling your leg. Can you find a friend with a laptop to test your connection? That's one way to isolate the problem area. Can you do this for us?
Open a DOS window and type:
IPCONFIG /ALL >C:\RESULT.TXT
Open C:\RESULT.TXT with Notepad and copy/paste the entire results here.
Open a DOS window and type:
IPCONFIG /ALL >C:\RESULT.TXT
Open C:\RESULT.TXT with Notepad and copy/paste the entire results here.