Vista - Network Connectivity Problems

Suddenly having problems connecting. No SP1 on this machine. Running 32bit on home premium. I have home network set up with wireless router to dsl modem. Network is saved and is automatic. When it connects either wirelessly or via wired all that I am getting is windows default ip. Cannot connect to router or modem wireless or lan. The only way to connect of manual configuration of nics. How can I solve this issue? Have tried all the obvious, resetting, etc.. Any suggestions appreciated. Drivers are current for pc model per manf..

Hi movingtarget,

Have you updated any drivers between the time that it was working and now (specifically network drivers)? If so, use the information in the following Tutorial: Device Manager - Roll Back Driver. Select the 'Network adapters' category and follow the instructions.
I also notice that you haven't installed SP1 yet. You should really install this important update as soon as possible as many newer updates need this installed to work properly.
Here is a link to SP1: Download details: Windows Vista Service Pack 1 Five Language Standalone (KB936330)
As a bonus, here is a link to SP1 for Office 2007: Download details: Microsoft Office Language Pack 2007 Service Pack 1 (SP1)
As a bonus, both these Service Packs will fit on a standard 700MB CD.

No recent update of drivers done. Haven't downloaded sp1 specifically for the reason of the driver related issues. My hardware is very xp compatible but with vista sp1 I don't know what would result. XP may have been installed previously as at boot it prompts to boot from previous version of windows. Unable to do so, however, says ....No NTDLR or something of that nature. Anyway is Toshiba system with vista pre-installed. It only works right now with ip address specified on NIC. Seems that if it was driver problem this would not work either.

Anyone else with some ideas. Not very computer savvy so some suggestions as to where to look?