I did 1) and 2) at the first place and it did'nt work. I uninstelled the Compact (which i was downloaded just because name of program sounded right and i had tried everything else )
I still couldn't install NET 3.5 SP1 as not previously, so i tried again to install paint.net.
If I disconnect my computer from internet, install can't begin. If i not, it freezes to 18% as previously