ok so i let krish get killed and so i whent to load but like the dum nut i am i hit save nooooooooooooo
so I found how to get him back but now he will not follow me and will not open the door for me just walks here and there and when i talk to him he says lead the way please hlep me thax

Try looking on the Uesp website. It usually gives help on that sort of thing. Otherwise go back to an earlier save or the previous Autosave.

I saved over them because im dum like that and i looked on the UESP web site but did not see any thing so if any one can help i need it

UESP has this info. (I don't know if it helps if you have let Krish die. Perhaps this breaks the game intentionally.)

Exploring the Caverns
You are now exploring the caverns along with Krish. There are a number of grahls patroling the place and, fortunately, they are less powerful than the grahl you met on The Skaal Test of Loyalty quest to restore the Gift of Sun. Be warned that although Krish is relatively fast, he will not last particularily long in a fight, so guard him well. Once you've killed all the grahls (eight in total) Krish will speak to you again saying it is safe to enter the castle. Continue on and enter to the Banquet Hall of the castle. If, for some reason, Krish becomes stuck or frozen once the last grahl has been killed, you cannot enter the Banquet Hall, and thus can't continue. You can use the console to summon Krish to your location in order to continue. Open the console and click on Krish and then travel to the entrance of the Banquet Hall and enter the three commands:

setpos, x, 370
setpos, y, -178
setpos, z, -117

Several people have reported encountering this problem. It may be related to the game thinking that the fight with the last grahl is not over, even though the grahl is dead. A quicker fix is to attempt to rest (press the 'T' button) and then cancel it, or even to rest for a bit. Krish should become unstuck once you do this without having to reposition him manually.

Alternatively, a somewhat similar problem may occur when you have killed all eight trolls, but for some reason, it doesn't register with Krish. In this case, you have to tweak the script. Open the console and type in the following:

set trollsdead to 8

As soon as you enter this command, the dialogue with Krish will open, saying you can move on to the Banquet Hall.



As an alternative you can advance the quest via the console by typing Journal Quest ID Quest Stage. You can get the quest ID and quest stage through the construction set. I don't have MW CS on this machine so I cannot check the precise references for you but there will be info on use of the CS on the forum.