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Apple don't put their OS on DVD any more. It's usually downloaded directly from the internet. But, if you live near an Apple Store you could take a USB Memory Stick in the shop and one of the guys could download the installer to the stick.
You could also try downloading from here www.fenopy.se/?keyword=Mac+OSX+10.5
If your machine can handle it (CPU 2.4 GHz Intel Core 2 Duo
or better), get the latest OSX 10.9 Maverics.
It's now available for free.
But you may need to use a friends Mac to download off the internet!
You can also make a bootable USB 32GB memory stick to assist.
See OSX Lion 10 7 3 USB STick Creator
To find out more about your Mac Model and all of its capabilities... download a copy of MacTracker.
These days you really must have an external hard drive of at least 1TB or so to keep copies of your files on. Partition the drive into 2or3 parts and keep one (60GB) as a clean OSX emergency boot.
I always use Carbon Copy Cloner to make a bootable "CLONE" of my PowerBook on my external drive.. That way if you ever get into boot problems you just connect the external boot disk, Restart the Mac, then hold the option key down and choose the external OSX Boot drive that you want to restart from. Then you use the Disk Utility program to fix Permissions & Test your internal Hard Drive.
I make a "CLONE" at least once a year then test that it boots then I wipe (Format) my internal HD and install clean updated OSX. Reboot and choose the Migration Assistant to put all my data back from the Clone I made.
Have been doing this for years now. Keeps the Mac software in prime condition.
Hope All That Makes Sense
1. Start computer up, holding OPTION key 2. Select Recovery 3. Select language (I'll choose English) 4. Disc Utility 5. Macintosh HD 6. Select Erase tab 7. Erase Disc 8.
back to OSX Utilities - Select Reinstall OSX (this makes it so your
most recently installed operating system will be restored. I bought my
Macbook as a Leopard, but it runs Mountain Lion now.) 9. Reinstall to Mac HD
It's not the same ScanWizard Pro software that used to work on my PowerPC G5 running OSX 10.5 Leopard, but at least it enables me to use my ScanMaker 9800XL with my late 2011 17" MacBookPro and OSX 10.8.2 Mountain Lion. Get it, it works!
The most common problems I've experienced with Mountain Lion are the following:
Reduced battery life. I've noticed about an hour to an hour and a half cut off from my battery life of my Macbook Pro. I'm not sure if this applies to you since you have a Macbook Air, but my recommendation is to try a reinstall if you experience battery problems and turn off some of the extra features like Twitter integration and iCloud when you're not using them.
Safari is crashing. Safari is a browser that used to have little respect but now has actually gotten pretty decent. However, with Mountain Lion it actually crashes a lot more than usual. I don't have a fix for it offhand, but I would recommend just using Chrome (which I use anyways) or Firefox. And stay away from Explorer!
Free upgrades to Mountain Lion. When I got my free upgrade to Mountain Lion (if you purchased a Mac after June 11, 2012 you can get one too) it took Apple about 5 days to upgrade me to Mountain Lion. This is a super low priority problem, but it's still something I hope they're working on.
Notes synchronization. I have answered this on FixYa already, you can find it on the site.
You need to re install your windows operating system. You can use OSx on IBM compatible systems but then you will face problems with leagality. Apple don't want you to run their OS on something that isn't made by them. Even though all of the parts are the same (just cheaper) If you are lucky you may have a restore partition on your system, to access this you need to restart and press "F8" then pick "restore to default(or factory)" Hope you are lucky.
The printing application requires rosetta so is not supported in lion. As the actual printer is discontinued the two choices are: 1. Get a new printer or 2. Run snow leopard WITHIN Lion using software such as 'Virtual Box'. http://m.zdnet.com/blog/apple/run-virtualized-snow-leopard-and-rosetta-on-lion/10898