DNS caching error seem to be not fixing

[invizible]

Hello everybody, , i have DSL connection 1mbps and my isp router which is connected with my wifi linksys router (cascaded router) … my laptop is connected wirelessly with linksys router while my desktop pc which i bought 3 days ago is connected through ethernet cable with linksys router, my this configuration was working perfect untill yesterday and i was able to access the internet on my desktop pc without any problem but today in the morning as i turned on my pc my pc was connected to the router but there was no internet activity..i tried repairing the connection but got error unable to clear dns cache then i tried this command ipconfig /flushdns but it got failed too then i tried this command in cmd "REG ADD HKLM\\SYSTEM\\CurrentControlSet\\Services\\Dnscache /V Start /T REG_DWORD /F /D 2"
and i checked my dns client service was started and automatic and running fine….everything is fine but still my internet connectivity is not working ..even though after running the above command i tried repairing my connection and im not getting dns error anymore but still internet connectivity is not working…any reason? yes but when i try network diagnostic on msn messenger i still get dns error in troubleshooting.. is it because i updated my windows last night? sp3 is the source of problem?? any reply will highly be appreciated, thanks in advanced and yes my NIC card is working fine since im connected to linksys router via ethernet cable 100mbs

[connall2007]

Are you running Norton?? I had this prob,i had to uninstall sp3,then re-update sp3 with Norton360 turned off b4 update,or theres an hotfix here,but if youve the newest sp3,this may be of no use,but worth a shot.....good luck

http://support.microsoft.com/kb/953979