a copy of the Snow Leopard installation disk.
I need to reinstall my OS (OS X 10.6 Snow Leopard) whilst retaining my Applications and Data. Apple support say this is possible by restarting the Mac whilst holding down the Command and R keys. This seems not to work on my machine and the System boots as normal but does not launch the Mac OS X Utilities application as Apple says it should. Any advice would be gratefully appreciated.
Isumbras
Model Name: iMac Model Identifier: iMac10,1
Processor Name: Intel Core 2 Duo Processor Speed: 3.06 GHz
Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 4 GB Bus Speed: 1.07 GHz

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