When updating to IOS5 restore did not complete and now it is asking for a password to carry on restoring back up and I can't remember password! Would appreciate any help?

Whilst updating to IOS5 on my iphone 4 it was interrupted whilst restoring the contents of my iphone!!!  Now when I try and restore it asks for a password to unlock my iphone backups - I have tried several but it states password is incorrect and accordingly I cannot restore backups and have lost loads of important information!!
I would really appreciate your suggestions on what to do.
Many thanks

Place the iOS device in Recovery Mode and then connect to your computer and restore via iTunes. The iPod will be erased. Some glitch occured and you have to restore/erse the iPod. Y will have to restore from an existing backup if y ohave one.
iOS: Wrong passcode results in red disabled screen                         
If recovery mode does not work try DFU mode.                        
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings        
For how to restore:
iTunes: Restoring iOS software
To restore from backup see:
iOS: How to back up     
If you restore from iCloud backup the apps will be automatically downloaded. If you restore from iTunes backup the apps and music have to be in the iTunes library since synced media like apps and music are not included in the backup of the iOS device that iTunes makes.
You can redownload most iTunes purchases by:
Downloading past purchases from the App Store, iBookstore, and iTunes Store        

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