internet login fail

Hallo, intermittently, I get the Windows login fail screen for unknown reason and the solution proposed is to unplug the modem adapter for 20" and replug it and then it works good.
Windows Diagnostics Networking says: event-id: 6100
event from Helper-Class (Auto Config Helper Class)
MS Technet: errors - no results found
modem (wired) is D-Link DSL 320T (ADSL2+ modem)
I run ie9 but with ie8 the same ocurred.

Hi, welcome to the forum. Sorry to hear you're having problems.
You may find information in this link of interest, regarding your connections login.

D-Link DSL 320T (ADSL2+ modem)
http://www.dlink.co.uk/cs/Satellite...95806691854&pagename=DLinkEurope-GB/DLWrapper

Not indicated what your version is but the link will detail any upgrades available to you.
Hope this helps.
Thank you.