Invalid Checksum when trying to update MAC OS X 10.6.4

Hi all.  I own a 15 inch laptop mac i purchased in 2009.  I have recently realised that my MAC software has not been updating or installing correctly.  I tried to manually download the software 10.6.5 ( as i currently have 10.6.4) and it came back with an invalid checksum error.  I retried the download several times and got the same error.  I also tried other downloads and also got the invalid checksum error. (.DWG files).
Another thing that seemed strange was that i had been trying to download 'star walk app' for my iphone and also a jamie oliver recipe app however these files seemed to keep restarting their download due to errors.
I have done some research and the possible issues i have come across are:
- possible internet connection error.  This doesnt seem to be the problem as i can stream youtube etc with no issues..
- possible RAM error.  How do i check this is the problem without purchasing new RAM chip?
- corrupt download.  Cant be this due to all my files being corrupt.
Can anyone help me further with trying to solve this issue? 
I have been so happy with changing to the Apple life and now i am starting to regret it as i am finding it near impossible to repair my laptop.... 
Any help is appreciated, Thanks

If you think your Mac is having hardware problems, I'd run the diagnostics that came with your Mac.  If the diagnostics came on a separate disc, run them by holding down the "C" key while booting with that disc in the drive.  If you only have one "system restore" disc, hold down the "D" key while booting with that disc in the drive.

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