Can I delete the "Previous System" folder ?

Hi all experts,
My system has been having problem after i installed the Adobe software but still useable. All software remains okay except to startup Adobe, it takes unusually long.
Then one unfortunate day while watching YouTube it hanged & doing a force quit won't help as the beach ball keeps on rotating endlessly. So I turn off the power. After that it cannot start-up anymore.
The salesman asked me to start up using the disc I originally have and do an "Archieved Re-installation" and select saved all the settings. He said I have to do that so that all my installed software remains.
Because my installation disc in Ver OS 10.5.4 after installation, it is still very slow. After updating it to 10.5.8, it now becomes back to original but the following problem remains:
a) starting Adobe programs remains slow, how do I overcome this problem ?
b) how come I still have Adobe under the application ? Can I move it to trash & reinstall again ?
c) can I delete the folder "Previous Systems" ? (because it eats up a lot of my HD space)
Thanks

Mac Engineer since 84 wrote:
a) I have to admit that I don't use Adobe Creative Suite 4 very much because I spend most of my time using developer tools. When you say it takes a long time to start up the applications is CS4 is it all of them? You know, they do take longer than most application to launch even in the best of circumstances. What model and speed of Mac are you using and how long does it take to launch each of the CS4 applications?
Mine is a 24" iMac with 4GB RAM, 2.8GHz & 256MB of dedicated VRAM. When I say it takes a long time, I was referring to something like 3 to 5 mins to start up each of the applications.
But the funny thing is once it started up & I quit the application and then launched it again, it will take only 15 to 30 seconds. This applies to all the applications in the CS4 Suite.
But if I shut down the whole system, it again took about 3 to 5 mins to launch the application again on the first time after shutting down the whole Mac. Again if I quit & re-launch, it only take 15 to 30 secs. This applies to all application in the CS4 Suite.
For your info, other application like Final Cut, iMovie, iPhoto ... etc remained okay & unaffected.
b) You can move the CS4 applications to the trash but you'll never find all the other installed pieces. I would just install fresh over them.
Can you please elaborate. I don't understand what you meant by "other installed pieces" and "install fresh over them". Thanks
c) The Previous System does not contain your files or preferences so you will not lose bookmarks or songs.
Thanks for the info & confirmation
d) I don't have songs with DRM from iTunes so I know nothing about the authorization mechanism. I'm sure that has been gone over ad nauseam on these forums and you'll be able to find something on a search.
Okay, I shall try to post on the iTunes section.
Thanks

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