My Mac keeps freezing and is very slow

I have a 2.8GhZ 24" iMac. I've had it for about a year and a half, without a problem.
Then about a week ago it crashed for the first time. Ever since, it has been very slow and freezes regularly. Programs crash a lot.
Any ideas? Reasons? Solutions?

I have about 70% of my hard drive empty. I've given it a virus scan.
The disk is in the loft in the Mac's old box, so I won't get it now. But I'll give it a try.

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  • Mac keeps freezing and crashing

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    EtreCheck version: 2.1.6 (109)
    Report generated 29 janvier 2015 10:43:44 UTC+1
    Télécharger EtreCheck à http://etresoft.com/etrecheck
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    Cliquez sur les liens [Adware] pour l’assistance avec la suppression d’adware.
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      BANK 1/DIMM0
      4 GB DDR3 1067 MHz ok
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