Slow system – problem with OS, software, memory, hard drive?

I am running a MacBookPro5,3 (Intel Core 2 Duo – 2.8 GHz, Memory = 2 x 4 GB, Hard drive = NVidia 500 GB - 100GB of which is free space), using Mac OS X 10.6.3.
I was running 10.6.6. Then attempted a software update to 10.6.7 and the system essentially stopped working, Was able to back up data using target disk mode, and then reinstalled 10.6.3 using a purchased snow leopard DVD (had lost the disk that came with the computer). Worked for a while but have been having issues with increasingly long and frequent system slow downs (spinning beach ball). Recently attempted another system update, and the update failed and wasn't able to do anything. Used the 10.6.3 dvd and did a disk utility check – it initially said there was a problem with the hard drive – but on another restart from the DVD this issue disappeared (but still no working OS). Attempted connection of my computer to another laptop using target disk mode – this failed to show the target hard drive and only showed the dvd which was in the computer booted up in target disk mode.
At this point rebooted using the DVD and was able again to install system 10.6.3. However, there are still occasions of sporadic slow-downs associated with specific applications (spinning beach ball for anywhere from 5 – 120 sec). Ran disk utility from the DVD again – states that the permissions and the hard drive is OK. Also, ran a memory test (using Rember) which stated that everything was fine (although the test took nearly 2 hours to run and was punctuated by much spinning beach ball activity).
At this stage i am not sure whether I have a problem with memory, the hard drive, the OS or the software. Clearly something is not right – are there any other options to test my system (since I don't have the original dvd – I haven't been able to run a system hardware test) - other third party options?
Thanks in advance for any advice, and apologies for long post.
Rob

Sounds like a failing hard drive or SATA controller. It's not clear whether you have a backup of your data. If not, you should remove the hard drive from the machine and install it an external enclosure or dock, then back it up using another Mac. Then take the unit to an authorized service outlet for testing.

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