The update "Mac OS X Update Combined" can't be saved.

A few days ago my mac ( late 2009 model MacBook pro running lion 10.7.2 ) started freezing, a lot. The freezing seemed to be a problem with osx itself rather than with any particular program. So I initiated software update hoping that there would be an osx update. Low and behold, there was.
Here is the problem.... I can't get it. I have tried twice and both times I get this message
"The update “Mac OS X Update Combined” can’t be saved.
The update could not be verified. It may have been corrupted or tampered with during downloading. The update will be downloaded and checked again the next time that Software Update runs."
Any ideas?

Ok this problem has developed somewhat.
My machine has gone from bad freezing spells to being downright broken.
I rebooted the machine and got stuck at login screen.
Rebooted again and didn't get to login screen.
Rebooted again and got logged in but my desktop was unresponsive and then started flashing between the desktop image and a plain grey screen. I did this literally all night (left it over night).
So today I have booted up from an install of lion I have on an external FireWire drive. And all is well. I am trying to backup things like my photo library and other documents so that I can format the internal hard drive and and do a clean install.
I can access the hard drive, see all the files, but when trying to copy it over I get an error message saying
"the finder can't complete the operation because some data in "iPhoto library" can't be read or written ( error code -36 )
Now before anyone screams broken hard drive, the data can be read, because I can view it all in finder. Just can't copy it out to an external drive.
Please help!!
Oh ps. Before booting from the external I created a new admin account on my machine and booted int that. The freezing problem was the same as in my normal account.

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