ok, no router.

still same issue; didn't find DHCP from the modem.

Use View Network connections->Properties
scroll down to TCP/IP, click property button

enable DHCP for both IP and DNS

click the Alternative config
clear everything

click OK to save

get a command prompt

ipconfig /release
ipconfig /renew

ipconfig /all

and we should get a non-169.x.x.x address

sometimes the provider gives out instructions for manual settings like default dns and gateway. did you get a sheet of data to configure the computer for the internet?
then you may have to configure the tsp/ip settings yourself and not let the nic get autoconfigured.

I suspect it may be due to a problem with your MTU settings, I have had this problem before and changing these settings cured the problem. If your using a USB modem use Drtcp from http://www.dslreports.com/drtcp. Try dropping MTU to 1400.

Guys, thank you for replies. I've been very busy at work last two days and had not time to continue with troubleshooting the L-top. Today I will give it a try for all the suggestions you gave me and let you know. Thanks again.

Hello Jobeard,
thank you for replying, I tried to do as you instructed me, but I could not
find where to enable DHCP for both IP and DNS.. I don't use static ip.
I did not get any data sheet about Network Configuration from my ISP.
I don't know how the network gets normalized when I go to sleep mode and return
to reconect and browse internet normaly!!..

thank you all for helping

Hello Hodsock, thank you for your suggestion. MTU solved my problem.
Based on what I read, different hardware use different MTU and Vista could not properly set settings...
Problem solved. Now surfing fast.

thanks fpr posting back the solution!
I should have thought of this as well but I use a tool called tcp optimizer which corrects the mtu automatically. so that was never in my mind....

anyway glad the forum could help you

Hello Mscrx,
thank you for your contribution as well, I learned many things with you while you walked me through troubleshooting steps for the problem I had. I never had an idea about those procedures.
Thanks again, this is wonderful forum.