Why won't my Mac won't update?

I've tried twice now to update MacBook Pro (mid2012) Software Update 1.0 version 10.7.4   size 1.14 GB
the first time i was using wireless connection. i thought that was the problem and direct hooked it up to our DSL box and it still didn't install the updates. (both times it takes over 10 hours to download) i keep getting this:
--The update "MacBook Pro (mid2012) Software Update 1.0" can't be saved. The update could not be verified. It may have been corrupted during downloading. The update will be downloaded and checked again the next time that Software Updates runs.--
i also have another update Mac OS X Update Combined version 10.7.5 size 2.04 GB. i haven't even tried that update as it says it will take over 20 hours to download it. other updates are Java size 66.8 MB and iTunes 194.1 MB but files those size usually download just fine.
is it possible that i have a problem with my computer or is it just a connection to the internet problem (no one in my area has high speed internet so i can't hook up to that and see if that's the problem)? should i take my Mac to The Geek Squad and have it checked out??
or it there not enough space?
Capacity: 499.25 GB
Available: 452.79 GB
Used 46,456,381,272 bytes (46.46 GB on disk)

You don't have to install 10.7.4. That's caused because Software Update is already telling you to install a newer version.
You have enough free space to install OS X 10.7.5, so I recommend you to download OS X 10.7.5 from the Apple site > http://support.apple.com/kb/dl1582
If you can, you should update connected to Ethernet in a fast-speed connection. Ethernet improves a lot the Internet performance depending on the network

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