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By Patrick Seitz
Investor's Business Daily
Apple Computer retailers are treating the next Macintosh operating system release like it's the latest Harry Potter book.
Store owners nationwide are planning parties, midnight madness sales, T-shirt giveaways and in-store demos for Mac OS X (the Roman numeral for 10), which goes on sale Saturday.
But whether Apple Chief Executive Steve Jobs can show the wizardry of the fictional Potter is another story.
Apple Computer Inc.'s share of the personal computer market hovers around 3%. Microsoft Corp.'s Windows operating system has dominated the PC market since 1995, when it copied Mac's simple …