Reusing Installation Discs and Upgrade Questions

Is it possible, or even legal, to use the Snow Leopard installation disc that came with my 15 inch Macbook Pro to install the OS onto my 20 inch iMac core 2 duo (its OS is Tiger)?
I have been wanting to update the OS on my desktop for a while and would rather not have to buy another disc when one came with my new laptop.
My other question is when I do go through with upgrading the OS on my desktop, will there be any type of data loss or stability issues?
I've never upgraded the OS on any of my computers before, having to replace a dying computer usually happens long before I need to upgrade the OS.
Any advice would be greatly appreciated.

Echoing captfred WRT backups:
Get a bootable, external HD (preferably FireWire, since it's 40-50% faster than USB 2 and designed for data transfers), make a bootable backup/clone before updating/upgrading, and ensure that it's bootable and works like the original. That allows you to revert to the previous good state without having to reinstall or reset anything. See these for details:
http://docs.info.apple.com/article.html?artnum=106941
http://www.macmaps.com/upgradefaq.html
http://www.macmaps.com/backup.html
http://www.thexlab.com/faqs/installswupdates.html
http://www.thexlab.com/faqs/backuprecovery.html

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    hi there!
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    Kolindo.

    Kolindo wrote:
    the computer was bought 5 years ago so i have only one disc which is Tiger.
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    Message was edited by: tutlek

    tutlek wrote:
    3. this is bothering me the most: the display of the MB is horrible, the colors are faded and the whole screen is bluish. The best and closest (but still not normal) appearance the display has when the MB lid is open as wide as possible and I look at it almost from below (a view 45 degrees from below makes the text of web pages legible, though the gray brushed metal-appearance of Safari, for example, still looks light blue rather than gray). I did check postings on this forum and found that the color settings can be changed in display preferences, and that something called "color LCD" is probably the preferred setting for a MB. Interestingly, my MBP is set to this setting and has a total of 6-7 different settings to choose from. However, the MB does not have this setting ("color LCD") and has only 3 different settings, though both MBP and MB are now 10.4.10. Needless to say, my glossy MBP display looks fantastic. How do I get the MB to look that way too? Can I download this "color LCD" setting from somewhere? (BTW, I did notice on in-store MBs, particularly in non-Apple stores such as CompUSA, in the past this issue with faded colors and a bluish discoloration, some of them even worse then this "new" refurbished MB. I was in the local Apple store yesterday evening for an unrelated issue and looked briefly at the newest black MBs, their colors are somewhat more faded and bluish than my MBP, but not like our new MB).
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    I posted this in Photoshop and got no response so i am re-posting it here. (thanks)
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    function(){return A.apply(null,[this].concat($A(arguments)))}
    My daughter has photoshop cs4 via one of the suites (design premium).
    It was originally installed on her old computer as a 32 bit version.
    She now has a 64 bit machine. I drive imaged the old drive to the new machine and did all the hardware drivers, and it is working perfectly.
    It is vista home premium.
    How can she upgrade to the 64 bit version of photoshop without breaking her installation or loosing any of her work?
    If I upgrade her OS to windows 7 Pro (x64), will that be a problem?
    Cannot answer you definitely about installing 64 bit Photoshop but I suggest inserting the DVD and installing Photoshop only. The DVD should pick up that you're on a 64 bit OS and offer you 64 bit Photoshop.
    I suggest clean installing Windows 7, rather than upgrade installing. That would mean reinstalling all software and drivers but it's the most reliable method in my experience.
    function(){return A.apply(null,[this].concat($A(arguments)))}
    I have downloaded the master suite trial instalation files onto my drive. My goal is to create an installation dvd set and use it to install trial versions of the various products on a couple of different machines. The entire folder structure is over 8 gig, So i need two DVDs.
    How do i split the resulting un compressed master suite installation folders to two dvds so that it functions as an install dvd?
    If my son ends up buying just one product (say dreamweaver), Can he unlock the copy of dreamweaver that was installed via the master suite install dvd? or does he have to uninstall the master suite copy and re-install the dreamweaver cs4 download?
    If the trial expires, can he unlock it at some point later if he purchases a key?
    Does each product within the master suite have its own trial expiration date based on when that particular product was installed? or once you install one product from the master suite install dvd, the date is set for all products?
    Thanks
    Jerry C
    I suspect you'll struggle to split Suites to install individual products on various machines (if that's what you mean). Suites are far more than a simple collection of the individual software titles. They're tightly integrated, must be installed on the same machine together and are all tied to a single suite serial number which is unrelated to the individual product serial numbers. I believe the downloaded Suite file has to be installed as one.
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    If your son only purchases Dreamweaver, he'll have to uninstall the Master Suite and re-install the DW download.
    If the trial expires, it'll keep showing a Trial has expired screen and you cannot go further. Once you enter a valid serial number, it'll launch normally.
    My understanding of the Suites is that all products are integrated. Once the trial version of a single product in the suite is launched, my understanding is that the clock starts ticking for all products in the suite. That said, I have not tried launching individual products in the Trial versions more than 30 days apart.

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    My daughter has photoshop cs4 via one of the suites (design premium).
    It was originally installed on her old computer as a 32 bit version.
    She now has a 64 bit machine. I drive imaged the old drive to the new machine and did all the hardware drivers, and it is working perfectly.
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    If the trial expires, can he unlock it at some point later if he purchases a key?
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    How can she upgrade to the 64 bit version of photoshop without breaking her installation or loosing any of her work?
    You can't. This can only be done wit ha proper install after the old stuff has been uninstalled. You won't lose any work, the installers only care for their own files, not user-generated data.
    If I upgrade her OS to windows 7 Pro (x64), will that be a problem?
    Just to be on the safe side, always deactivate, then re-activate after the update.
    How do i split the resulting un compressed master suite installation folders to two dvds so that it functions as an install dvd?
    You cannot. Installer spanning only works if you downloaded or bought the proper DVD version that is already pre-configured into two separate packages. Use an external hard drive or memory stick to transport the files instead.
    Can he unlock the copy of dreamweaver that was installed via the master suite install dvd?
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    If the trial expires, can he unlock it at some point later if he purchases a key?
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    Does each product within the master suite have its own trial expiration date based on when that particular product was installed?
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