Help w/ database error

[barcena]

Hello everyone.

I have been having problems with my site since Yesterday

PHP Code:

MySQL Error : Table './xxxx_forum/post' is marked as crashed and last (automatic?) repair failed
Error Number : 144 


After an excruciating day looks like that error is sort of fixed, I were able to open the site and now we can do everything and move trhough forums etc but now I'm having a new db error related to postedithistory, whenever I need to edit a post I'll get this on Save Changes:

PHP Code:

MySQL Error : Table './xxxx_forum/postedithistory' is marked as crashed and last (automatic?) repair failed
Error Number : 144 


My host is specialized in vBulletin but they haven't being able to fix the problem or they may want money from me or I don't know what. Do you guys have any suggestions, anything I can suggest to them or to the guy that is helping me? I'll appreciate that very much because I?m getting nuts here.

Thanks.