m3rk

It's kinda weird because I can't browse the internet after 1-2 hours after windows startup but I can ping any sites using the command prompt, play any online games, download using my utorrent and update my antivirus. This problem occur last Wednesday I think. Tried to disable then enable again in the network connection but didn't work. The only way to browse again is to restart which is crazy.

Tried:
1) Reinstalling my network driver.
2) Scan for viruses and spywares.
3) Update using windows update
4) Reinstall OS then update again using windows update

Now I reinstall again my OS but didn't update using windows update yet(disabled it). I think the update this month is the culprit but I'm not pretty sure. Right now I don't have any problem with the internet. Anyone here can help me figure out what's the problem?

System:
Core 2 Quad 2.4Ghz
2GB DDR2 800 RAM
Seagate 250 GB SATA HD
8800 GT
Gigabyte GA-G31M-S2L (I'm using the built-in lan here)
Windows Vista Ultimate SP1 32bit