Problems upgrading to snow leopard from leopard

I have big problems with my iMac since trying to upgrade from leopard to snow leopard last night.
I went through the instillation disc but after the restart my mac won't open up, it just hangs on a white screen with an apple logo and spinning icon (not beach ball).
The snow leopard disc is still in the drive.
Just to clarify, the instillation was successful, but when prompt to restart the mac won't.
The mac is well up to the specs of snow leopard, and after snow leopard i was planning on upgrading to lion.
Can anyone please advise me?
Thanks
Dave

Reboot and hold the Shift Key down, this is Safe Mode
You apprantly have some older third party software that has installed a at boot kernel extension file, you need to look at
#7 Safe Mode and "Gray Screen" issues (also can be white or blue)
then drop down to #14 to find out what is the problem in Console
uninstall this software or update it so it's compatbile with 10.6.
you also need to use Software update under the Apple menu and follow the other fixes accordingly.
Step by Step to fix your Mac
If you can't get things to work then drop down and do a #18 Reinstall Just OS X
If your doing this to upgrade to 10.7 you should read this
10.5 to 10.6 to 10.7 upgrade experiences

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