Not sure about upgrading from Leopard to Snow Leopard, Sugguest??

I am thinking about upgrade from 10.5 to Snow leopard, but afraid anything would go wrong, which I can't afford that. Beside my leopard runs perfectly fine now. The only reason I am thinking about Snow leopard is I wants to install Win7 through BootCamp to open up some application only available in Windows.
There are so many problems from what I read so far for upgrading. I am just wondering if the benefits is more than the troubles?
Here is what I am scared of:
1. lose the programs/applications I have on leopard.
2. lose the files, program setting I have.
3. SL create crazy problem that I cannot solve.
Any suggestions? Thanks!!

Here is what I am scared of:
1. lose the programs/applications I have on leopard.
Shouldn't happen, but if anything goes wrong you could lose everything. You need to be prepared with installers and serial numbers with all your applications. This is not specific to this situation, you need that at all times. Your hard drive could decide to die tomorrow, and then where would you be?
2. lose the files, program setting I have.
See my answer to #1. You must have backups for any data files you aren't willing to lose. If you don't have backups, that should now be your new highest priority in life if you value your data. See my [Mac Backup Guide|http://www.reedcorner.net/thomas/guides/backups>.
3. SL create crazy problem that I cannot solve.
Make sure your computer meets [Snow Leopard system requirements|http://www.apple.com/macosx/specs.html], and make sure your software is compatible:
http://snowleopard.wikidot.com/
You should also check any hardware, like printers, scanners, etc, to be sure that there are SL-compatible drivers. Also, it should go without saying that you should [repair the hard drive with Disk Utility|http://support.apple.com/kb/TS1417] before any system install or update, though many people don't actually know that, so it must be said. If your system isn't problem-free, don't consider any system updates or upgrades until the problems are solved.

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