It seems they have changed the client a lot. Not only the UI, but also how the internal start-up works.
-XP: C:\Documents and Settings\All Users\Application Data\Battle.net
I found this help by a blue on us.battle.net forum
This helped me, so here's hoping it'll help others in similar situation :)
Hope this is something that blizzard will fix soon.
So for me the problem seems to be internet connection related. Now I'll adjust the cable modem settings and try to get it work through there.
I reinstalled the game again and the initializing bar got to about 60% but then it got stuck again. Force quit SC2 and tried again, got stuck to 5% again.
Does anyone knows what it does when it initializing data?
I have tried it in safemode.
I have updated the drivers for my graphic card and network card.
I formatted my computer and installed win7 again. (after that it got even worse. Before that it was slow but I could play.)
I have open all the ports on my router for sc2.
I have tried it with no "startup" programs at all.
I have hit my head against the wall.
..But nothing helps!