I know that for each product I can set a maximum order quantity to -1  (unlimited) but I have about 400 products and would like to know where  in SQL I can simply go and do a mass add of these (if this is indeed the  fix). I imported my products from a spreadsheet I created for version 3.98
 
When I try to add a product to the cart I get the attached message. 
While I'm here, another quick question. I read somewhere that when doing updates you should blow away the old install and reinstall. Should I just not delete the files then? Or has this changed and now doing upgrading is better than uninstalling old module. It's kind of a pain if I would have to completely reinstall, and I can't imagine a company with over 1000 products would want to do this.
 
Cheers,
 
-Mike