"WindowsUpdate_80070570" "WindowsUpdate_80073712" Errors

First follow these steps for running The System File Checker tool:
To determine whether the issue that you are experiencing is caused by one or more system files that are used by Windows Vista, run the System File Checker tool. The System File Checker tool scans system files and replaces incorrect versions of the system files by using the correct versions.

To run the System File Checker tool, follow these steps:

1. Click Start, and then typecmd in the Start Search box.
2. Right-click cmd in thePrograms list, and then click Run as administrator. If you are prompted for an administrator password or confirmation, type your password or clickContinue
3. At the command prompt, the following line, and then press ENTER: sfc /scannow
4. When the scan is complete, test to see whether the issue that you are experiencing is resolved.

Test Windows Update, Does this resolve your message?
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If not let us try Resetting Windows Update Component Manually through the following steps:

Click Start, and then type cmd in the Start Search box.
Right-click cmd in the Programs list, and then click Run as administrator. If you are prompted for an administrator password or confirmation, type your password or clickContinue
At the command prompt, enter the following commands (you may copy and then paste them by right clicking with your mouse and selecting paste), and then press ENTER after each:
net stop wuauserv
net stop bits
net stop cryptsvc
ren %systemroot%\System32\Catroot2 Catroot2.old
net start cryptsvc
ren %systemroot%\SoftwareDistribution SoftwareDistribution.old
regsvr32 wuapi.dll
regsvr32 wuaueng.dll
regsvr32 wucltux.dll
regsvr32 wups2.dll
regsvr32 wups.dll
regsvr32 wuwebv.dll
net start bits
net start wuauserv
net start Eventlog
exit
Reboot and try update again.

Let us know your results.