Reinstalling Photoshop CS5?

I have been using Photoshop CS5 since June 2010 and two days ago for some reason it stopped opening any jpg or psd files and would crash. I am on a Mac with OSX 10.7.4.
I have now uninstalled CS5 ( and kept my preferences and kept my activation).
I want to reinstall it again still on the same computer. I can't remember if I had a disc or got it as a download, but anyway I do not have an original disc. I do have my  serial number  from the Adobe My Products list and the date I registered it on this computer.
Where and how can I get a re-download for my Photoshop CS5 so I can put my serial number in and get back to work?
Would appreciate urgent help.
Many thanks

Hi jeff,
Since contacting Adobe regarding reinstalling Photoshop CS5 from a download, I have found my original install disc.
I had uninstalled Photoshop CS5 and now reinstalled it via the install disc and have run all the updates.
However, Photoshop is still crashing out every time I either try to open a file ( jpg, psd doesn't matter) or create a new document. I have done this so many times and it is still the same.
I have once again uninstalled and reinstalled from disc as before and same thing happens.
I have tried switching over to 32 bit and same thing happens.
Have run diagnostics on all 4 hard drives and all are ok and healthy.
I have  allocated RAM 70% to Photoshop 1470mb
I have upgraded to OSX 10.7.4 last month and been using Photoshop every day till Wednesday this week when it stopped working.
Are there any known issues with Lion and  CS5?
Do you suspect a hardware issue?
Many thanks for your prompt  response.

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