Trying to update software but after its downloading for a while, shuts off?

So i've been trying to do a software update but ive tried it 3 times tonight and the same thing keeps happening. I start the download, it goes for like 2 hours, and then the macbook just restarts. at first i thought it was restarting because the download was done but when it turned back on, nothing happened. i went back in to the software update and it told me i needed to download it all again. im getting really frustrated does anybody know what the problem is and has a solution??

You could do a safeboot; to do maintenance on the system, repair permissions, extra. http://support.apple.com/kb/ht1455
If your running 10.6:
then you could download manual install for the 10.6.6 combo update. http://support.apple.com/kb/DL1349 and install it
if your running 10.5
then you could download the manual 10.5.8 combo update, and install
http://support.apple.com/downloads/MacOS_X_10_5_8_ComboUpdate

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