Screen flashes every 3 secs and the finder resets

im on a late 2011 imac and the problem started when i was opening a dmg, before the dmg had finish the finder reset and i cant have acces to the folder with the file that i think is making all this flashing and reseting of the finder, i've even had tried to reset the size of the resolution of the screen and it just flashed and got back to the state it was when the problem started.

I did a "Repair Disk permissions" and that stoped the flashing(there was no sound with the flashing) but i still can not enter to the Applications folder, where the half installed app is, i've even tryed with the
rm -rf ./filename
comand on the terminal and that does not do the trick, reading more i saw some post that said starting the machine in "safe mode" i get the screen with the loading bar but i still cant get to the applications folder. and thats the status right now, ty for the sugestion but i think i need more help!

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