can't surf web pages after a few minutes

i've seen this problem twice now in the last two days, not sure what is causing the issue but i have found out what the fix is for it I think. the basic problem is IE stops surfing after a few minutes, also can happen in firefox, and problaly others and only happens in XP as far as i've seen so far
.
here are the directions on how i ended up cleaning it. (WARNING changing things in the registry can cause your system to run unstable and or not run at all.) it can also be fixed by doing a flush and fill of windows but most people aren't willing to do that as an option.

delete all temp files, go to c:\documents & settings\"username"\local settings\temp\ delete all files & folders in there, also delete all folders and files under the "temporary internet" folder under local settings.

now go to the windows folder and delete all files and folders under the temp folder and temporary internet folder if they exist.

check and remove all possible spyware and adware. (not sure if this problem is caused by spyware and adware or what, but it was a step i did to clean the problem)

now go to command prompt and type "ipconfig /flushdns" with out the quotes.

now add the follow dwords into the registery. you can cut and past these lines into a notepad and save it as a .reg file to make importing easier.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Dnscache\Parameters]
"MaxNegitiveCacheTtl"=dword:00000000
"MaxCacheTtl"=dword:00000000
"MaxCacheEntryTtlLimit"=dword:00000000
"NegativeCacheTime"=dword:00000000
"NetFailureCacheTime"=dword:00000000
"NegativeSOACacheTime"=dword:00000000

reboot computer

and that should fix it. or at least it did for me. but it took me 4.5 hours onsite to get to the solution. if you have any other question you can PM me and i'll try to get back with you.

All this connectivity issues stuff takes some understanding !;) - it can drive you nutz - look what its done to me ! :D

Here I guess its handy if you appreciate that not only do you get DNS resolution done at the 'far end' but it can get done locally too, & this gets stored in your DNS resolver cache, which also includes not only the recently queried names resolved by the system, but also entries from the Hosts file. How long stuff gets kept here is set in the registry ..

Adjust Windows XP DNS Cache Settings will confirm the reg keys etc above (if you just figured all that lot out I'm impress-ed ! ;)) & it also explains various reasons why your local DNS cache might not be 'valid'..

As a btw at least flushing the local DNS cache is something I try & remember to do when dealing with any malware issues, not always but mostly !, as I too have sat & looked at an apparently clean machine 'most puzzled' before realising .. :)