A nice way to boost up your stats is using these runes. You need this skill out of the warrior path: "enchant weapon" - and an enchantable item. Click on an item that has the description "xx charm quality", a window pops up and shows slots. According to your skill level these slots are either open or closed. Then simply open your "spell/book" inventory and drag a rune into the open slot of the item you want to boost up. In versions prior to 1.0034 clicking on this item for several times opened up multiple windows, so you could boost yourself up highly. This was a bug though and removed in the last patch version.

If your window opens off-screen:

You need to close the program, edit the config file (Divinity/Run/config.div)to increase the screen resolution (if you are already at 1024, you can increase to 1600). Restart the program, click on an item that can be enchanted, move it nearer the centre of the screen (check that it reappears here when you close it). Shut down the game, reset the resolution and away you go. To change the resolution edit the config.div file and modify the screen resolution accordingly. If that doesn't help, try deleting all of the files in the '.../Divine Divinity/Run/Dynamic' folder where you installed the game.This folder is used as a cache for the game. Files are created/copied there from the save game folder when you load, and written / copied from that folder when you save a game. The files will be re-created as required the next time you start Divinity. If there was a corrupt file in that folder, deleting the files should fix the problem.