Are these 2 sentences correct?
"Your business is quaranteed of success"
"Your business is guaranteed to succeed."
However weak the guarantee may be, I'd go for #2.
Please be aware that I'm neither a native English speaker nor a teacher.
You could rewrite #1 as The success of your business is guaranteed.
Your business is a guaranteed success!
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.