my iPhoto is unreadable

With the amount of information you've provided it's impossible to offer a solution. We're not mind readers nor can we see your computer so we need to know the details of your problem and setup, i.e.:

• what version of iPhoto are you using?
• what system version are you running?
• what do you see in the iPhoto window when iPhoto opens?
• what fixes have you tried?
• where is your library located?
• did you apply any updates or upgrades just prior to the problem occurring?
• are you running a "managed" or "referenced" library?

• what type of Mac?
• how much free space on your boot drive?

You really need to fix that

answer has the exact same level of detail that your post has - Zero

If you try again will do what we can do -- https://discussions.apple.com/docs/DOC-5931

LN