IMac responds slowly if at all

Hi several faults have appeared over Xmas whilst my 6 month old iMac was turned off.
Sign in corrupt (it has another password I cannot delete) til I refresh with startup again
Launchpad fixes then takes 2 minutes to open and I can see ghosts of other apps open
Safari Top sites just flickers and will not close easily
Pages documets open blank (I can see the detail in thumbnails) the pages show as black in sidebar
I have tried turning off and restarting but no change.
Does anyone have any idea what to do now!!
Thanks

I would do two things.  Boot into recovery (hold command and r keys down during boot, or alt/option key and choose recovery) and use Disk Utility to repair the hard drive. While there, repair permissions too. Does the repair drive complete without error? You may get some messages on the permission repair, which is normal.
If the repair hard drive completes without error, I would (re)apply the OS X 10.8.2 combo update. This has all 10.8 updates through 10.8.2 and can sometimes fix funky systems problems. Run Software Update after you install it. If that doesn't do it, or the alternative, is from the recovery menu, download and reinstall OS X 10.8.
Another thing you can do, just to confirm there's not a hardware issue, is to run the Apple Hardware Test. Don't expect it will show anything, but you can optionally run it if you want.

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