Within the past month I have come accross a similiar problem with getting internet access off a laptop. At first everything seems to work fine when going on a access point and surfing the web. Then all the sudden, the browser has a connection error and does not even try to get to the internet or a webpage.
What I have done:
-Cleared all temporary internet files, cookies, etc - reset browser to original settings
-Check for proxy server insertions in the Lan settings
-Disabled firewall and windows defender
-From command prompt: flushed DNS, checked there are IP assignments (there are and they look good), pinged google.
-Tried MSN messenger and going on network share s- this works.
What does not work is web surfing, regardless of what browser is used. There also seems to be no sign of virus in registry or msconfig, or even after being scanned.
Everything works except web surfing and an immediate error comes up "Not seraching for webpage or checking settings".
Also now, if i switch from wifi to wired, it still gives the same problem even with perfect ip settings.
The things in common among all laptops other then the above:
-Running Windows Vista
-Are using WIFI primarily
Any ideas? Help is appreciated!