Deleting and reinstalling my mac os software

Hi, my imac which i've only had 1 year is starting to freeze in the last week or so. I have plenty memor left so im confident it isn't that. i ran a permission check in utilities and it has come back with some errors and corrupt files. I'm running a repair but not optimistic of success. I use time machine and back up to a time capsule. can somebody tell me what i need to do to erase and reinstall everything or indeed restore from time capsule. I hate it when i'm rendered useless and don't know what to do to repair a broken computer. Any help is much appreciated.
thanks guys

Hi, I'm just about to lose the plot with my Mac. Can anyone suggest why my Time machine doesn't mount anymore please. I recently reinstalled snow leopard after i wiped my hard drive intentionally as my mac was freezing and all sorts. I had been keeping time machine backups on my T capsule, but now it won't mount when i hit the icon. Please help i have a lifetimes worth of music and family pics i need to recover otherwise my wife will have my balls served to our hungry dog.....

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