Error Type 11
Probable Causes: A miscellaneous hardware exception error indicates a hardware conflict has occurred, though this error may also be caused by an extension conflict or corrupt software. Hardware-related causes can be related to cache cards and SCSI devices.
Possible Solutions: When a system error occurs in only one application, try running the application with extensions disabled. If the error does not recur, begin troubleshooting for extension conflicts.
http://docs.info.apple.com/article.html?artnum=30929 Mac OS: Extension Conflict Troubleshooting/Extensions Manager Features
If this error occurs only in one application and while extensions are disabled, try trashing the application's preferences so the application creates a new one. If the error does not recur, a damaged preferences file was the cause.
If you're using is a cache card or accelerator card, remove it and try to re-create the problem.
Note: Do this only if you are familiar with installing and uninstalling Macintosh hardware. If you are not, and you believe the problem is hardware related, consider taking your Macintosh to a qualified service provider for help.
Another possible cause is one or more SCSI devices. Try troubleshooting the SCSI chain to determine if this is the case.
If, after performing these solutions, the error recurs, your hard disk may have problems such as bad sectors or a corrupted directory tree. Use a Macintosh disk utility to check for -- and possibly repair -- problems.
Also see Apple Knowledge Base Article
http://docs.info.apple.com/article.html?artnum=16004 This article discusses troubleshooting Type 11 errors.
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You can get replacement System Install & Restore CDs from Apple's Customer Support - in the US, (800) 767-2775 - for a nominal S&H fee. You'll need to have the model and/or serial number of your Mac available.
If you're not in the US, you may need to go through the regional Apple Store that serves your location to find the contact number. Here's a list of links to all of those -
http://store.apple.com/Catalog/US/Images/intlstoreroutingpage.html