My mac won't install anything

I have Mac OS 10.6.5 and I have had several issues that I'll summarize briefly:
- Could not download updates using software update.
- When I managed to download the updates (from the website, manually) my mac was not able to install them.
- It takes ages to start up, and 1/3 times finder does not respond, 1/3 times network won't work.
- I cannot install anything, I tried reinstalling the mac OS 10.6.3 from the dvd received with the mac but did not work. Received an error message (probably because either the dvd drive or the mac hard drive do not work properly).
- I cannot decompress downloaded folders.
- I have tried the hardware problem scanning by pressing "d" (or whatever key was) at mac start up with the application dvd inserted, but got no hardware error messages.
- Finally, I have a boot hard drive with windows 7 installed (that works perfectly fine), could that be a problem?

It's possible your hard disk is failing or is too full. Mac's need 10-15% of the total HD available. The easiest way to tallow much available space you have s to click your Hard Disk in a Finder wind then click Command - I. This will provide some basic information such as the capacity of the drive and how much is available.
If you have plenty of available space then open Disk Utility (Applications - Utilities - Disk Utility) highlight the HD on the left pane then click the First Aid tab. Look at the bottom right and see what the S.M.A.R.T. status is. It should be Verified, anything else and it's in trouble!
Also you can run Apple Hardware Test in extended mode, if you get back errors then report what they are and we will try to help you interpret them.
Roger

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