Macbook 2009 Not working properly [Error -50 and other several issues]

Hello there!
I am having several issues with my Macbook, they all showed unexpectedly. Most applications would not work, such as Disk Utility or Pages. Safari couldn't load any webpage, just after a long time it was able to display them. Also, I was having some kind of error -50 when trying to move or delete any file, and iTunes was showing the following message; "iTunes can't verify the identity of the server "ax.itunes.apple.com". The certificate for this server is invalid. You might be connecting to a server that is pretending to be "ax.itunes.apple.com". I couldn't turn off the computer either, when I tried to doing so it wouldn't do anything, I had to press the power button to turn it off. After that, I turned the computer on, everything showed up as normal but after a few seconds later the computer suddenly turned off, I tried again but I got the same result. Afterwards, I tried in recovery mode, and weirdly, it didn't show any problem. I ran disk utility and verified the hard drive but it says it's working perfectly. The SMART status also says the hard drive is fine.
What could this mean? All these problems appeard suddenly, I've never had any of those issues before.
I have a late 2009 Macbook with Mavericks Installed,
4GB of RAM,
A 320GB Seagate Hard drive,
And a 250MB Graphics Card.
Thanks for your help!

Hello there!
Thanks for your reply! I have no anti-virus software installed, but I have (rather said, had) CleanMyMac though. I installed the demo version and ran it only once. I was curious about it, I had no idea it could make as much damage as MacKeeper.
Also, I scaned again my internal Hard Drive with Disk Utility using the OS X Installation DVD, and according to the report, the partition where the operative system is located is corrupted. Disk Utility tried to repair it but failed, and the most reliable option was to reformat the disk. I proceeded to reformatting it but unfortunately the process was not succesful - I got an error that reads; "POSIX reports: The operation couldn’t be completed. Cannot allocate memory". I tried to reformat the disk using the terminal, but I was only able to erase it, not to format it. I did a research and I found out the problem might be the SATA cable, (https://discussions.apple.com/thread/3507546).
Could that explain also the weird behaviour when I was using the computer? I guess my best bet now is to get a new SATA cable.

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