Is it possible to copy my system library files to a different boot instal?

this is somewhat a odd and vague question in the title but to make a long story short[er]
i upgrade installed from 10.4.9 to leopard and was not too happy with the performance i got afterwards with different functions and apps.things worked funny or crashed randomly. i made a back up bootable partition and installed fresh a non upgrade leopard and have noticed ithings actually look different [file and folder trees, some minor graphics things] but also things that did not work for me in my main boot are working in this fresh boot [tablet and other 3rd party things]
now my everyday work and life machine is the main bootable but its driving me crazy the way a lot of stuff doesnt work as well as the fresh boot.
so my question is this:
is it possible to make a fresh boot and bring over specific things from my main boot so i can have the best of both worlds?
before you answer, i DO know how to copy over my email and settings and i know how the file tree for pictures and music works.
this question is more about programs and preferences and things i dont know about in the /lib and /system folders. i dont want to have to install everything all over again but i have a feeling if i just drag over the app to the correct folder its not going to work right.
and the reason i dont think copying everything over or cloning it would be a good idea is because i would run into the same issues im having now. i have had this machine for years and im trying to delete items and applications i dont use anymore to try and isolate any issues i have with the OS but it just makes sense to try and move over the few items i DO use to a fresh install that DOES work right.
so i would just like to know how to isolate apps and items and then be able to import everything associated with that app or item to get it to work as i want it.
any help would be amazing

Select a broken track, press CTRL+I to Get Info, say no when asked to locate it, look on the summary tab for the expected location. Where is that same track really? Comparing the two paths it should be clear what needs to be moved where.
Assuming you set \\Nas\Music\iTunes as the <Media Folder> and let iTunes "Keep organized" it will have shifted all of the content folders one level from \\Nas\MusiciTunes\iTunes Media\... up to \\Nas\Music\iTunes\... If you move everything except the library files, Album Artwork & Previous iTunes Libraries folder down a layer again it should all click back into place.
If not I have a broken link repair tool we can throw at the problem.
tt2

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See my "General advice on performing an Archive and Install" FAQ. Perform the steps therein in the specified order.
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Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
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(124159)

//System/Library/Extensions/AppleUSBEthernetHost.kext

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Thanks to you both, this fix worked for me too, after long ignoring the error message and vainly waiting for Apple to get around to an update.
Then last night I lost my Internet cable connection, which uses Ethernet between the modem and my iMac (Max OS X 10.6.8). At first, I blamed my ISP because the modem played up for a while, but after I rebooted it a few times, it returned to normal, but I still couldn't get online. I suspected, rightly or wrongly, that this faulty kernel extension might be the culprit. It took me 90 minutes' fiddling to obtain a slow Internet link, but that enabled me to download iTunes 11.4 from Apple.
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Is it possible to copy my system library files to a different boot instal?

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