Well i saw that 3 days before somebody post thread about almost same problem.
I reinstall windows vista x86 and when i Install warcraft it work fine for 1 day, another day i try to join bnet and i get erorr.
I am still using patch 1.23a but I getting that error (Unable to validate game version!) when trying to join bnet...
i reinstall again windows and again its work for 1-2 days and than again same problem.
before month i didn't had that problems.
Somebody pls help.