Bernardo
What you need to do to get to the root of the problem is to try and simplify the installation. I suggest you remove the Decklink card and try Premiere in native DV mode and see if it crashes (you must try for a while, not just a couple of minutes). If it does crash then there is a problem with your computer which will require you to go down the unplug/reinstall path.
If Premiere does NOT crash with the DL card unplugged then plug it back in and try the same DV PROJECT and see if it crashes. If it does crash then there is a problem with the DL card/drivers. If it doesn’t crash then there is a problem with Premiere or DL drivers/plugins.
Is there a common point where Premiere crashes?.. like when you apply a filter…? or when you try to export… ? Maybe watch your VM while editing and see if it continues to climb (indicating a memory leak of some kind)
(BTW… DL does not necesarily require SP2)