Hi ryanman,
First of all, there are many solutions already available for performing what you are requesting.
Some of them are part of the OS you are using .
Do you know about the existence of those several features?
There are several excellent Backup solutions (free) and those extremely reliable.
If you use “simple” backups – just have your CD and reinstall the system (sure unless you got that “special” Rootkit after which you have to though away your hard drive)
If you are using full Imaging Software (again available free very reliable) – you are basically fine.
So, a lot is available already out there ...
andComodo has few things under development already as well like Backup and Time Machine.Please just read the forum.
... OS gets corrupted or an over-agressive registry cleaner deletes an important registry key
Please. do not use any Registry Cleaner if you don't know what you are doing. Any Registry Cleaner should be used by more experience/advanced users otherwise forget about it. That's as simple as that.
There are many users that may not ever need any registry (

)
... or a newb uses A-squared anti-malware and deletes necessary windows elements
Can you please clarify, why
that particular Software was used as an example?
Do you know any other security Software that is not capable doing the same when user has no idea what he/she is doing when blindly using quarantine or deleting anything flagged, or even more... having auto-quarantine / auto-healing option set instead of just notification?
I hope you were reading about many "accidents" caused by many security Software out there and those security solutions are different to a-squared ... and they don't come even close to the detection rate of a-squared, which is the highest according to many test .. and that is very consistent for a long time
My regards