Up grade to Snow leopard and ... nothing more?

Hello There,
I recently upgrade my MBP to Snow leopard.
It worked a few days, much better than before.
But one day as I wanted to start, it gonged and ... stay on the Apple with the wheel running for hours.
I found here (on the forum) that I could restart it with a "start/gong/shift" process and that it will be better.
I have done this and after several trials, it restarted.
I worked a day with it and at the end of the day, as written on the forum, I have done a "usual" restart.
And again the apple and the wheel.
And now, no more "without extension" start.
Only the wheel and the progression bar that desappears after few minuts.
I clearly can hear the HDD working until the bar desapears and after that only the fan's roaring...
Any idea to give live back to my MBP?
Thanking you in advance for any solution.
All best

Hello,
I ran all the steps with no result until restart with the installation disc.
I started the installation and crash.
Right now, the situation is :
-the mouse works foolishlee, only from left to right and with difficulties from the top to the bottom of the screen.
-the dialog box display this message : the installation of the Mac OS X is not completed. If it continues to give error messages, the historic of the installation can help to have a diagnostic. I am sorry this a poor translation.
-the historic : localhost unknown [80]: 2014-02-15 LCA[79;903] _CFGetHostUUIDString: unable to determine UUID for host. Error : 35
                    localhost OSInstaller[142] : Error parsing distribution script from data
                    localhost xmllint[148] : /bin/sh: /usr/bin/xmlint : No such file or directory
                    localhost unknown[149]: Lauching the Installer Crash Log Viewer
If the mouse work, the option displayed are :
shut down
restart
save historic
display historic
Help!!!
Thanking you in advance.
Best

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    However, Photoshop CS4 will often crash when doing a "Save as", which is the whole reason behind my post. I've tried fixes found around the internet (rebooting in Safe mode, turning Open GL off, reducing the ram used to 50%....I'm at the one where they're telling me to turn off and on the network...we'll see how that works!).
    The other very strange thing with this whole thing, are 3 small scrambled windows that open with photoshop. I'll post a link to a screenshot :
    http://img403.imageshack.us/img403/949/screenshot20100115at105.png
    Obviously I'm posting this in this forum, because I haven't had any of those issues when I was on my PC.
    Oh, and as for the crash, it's more like a constant spinning beach ball.
    Any help would be appreciated.
    Specs :
    iMac i5
    8GB o' ram
    1 TB WD external USB2.0 drive attached, using Time Machine on it.
    OSX 10.6.2

    Have you talked to Adobe about this issue? I have used Photoshop CS4 on Snow Leopard, and havn't seen any issues. However, the scrambled windows look like what Top Sites in Safari looked like before they (supposedly—I still get it occasionally) fixed it in 10.6.2.
    Speaking of which, try re-installing the 10.6.2 combo update.
    Also, try using the uninstallers to remove Photoshop (don't forget to deactivate first), and then re-install it.

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