wyUpdate fails (0x0000007b)

I don't know; you didn't provide enough information. Some questions to answer:

1. Are you using a custom version of wyUpdate?
2. What version of wyUpdate are you using?
3. What version of Windows are you using?
4. Can you reproduce this on other computers?
5. What happens when you double click wyUpdate.exe, do you get this error?
6. Right click wyUpdate.exe, click Properties, is wyUpdate digitally signed? If not, then you've got a corrupt version of wyUpdate. Only use our version of wyUpdate. We don't support custom versions of wyUpdate.
7. Do you have the .Net Framework Installed? If so, which versions?
8. At what point does this error occur? (When you first start wyUpdate? After it checks for updates? Etc.)
9. Is the computer you're running on cracked, or otherwise modified? (Custom themes, replaced dlls, other garbage, etc.)
10. Did you run a Virus Scanner? Is the scanner up to date? Did it find anything?
11. Do you have a Windows Update pending? Did you restart your computer?

There can be multiple causes for this problem. For details, please refer to Microsoft Knowledge Base Artircle 324103 titled "How to troubleshoot 'Stop 0x0000007B' errors in Windows XP". In the context of a BootManage Administrator driven unattended Windows installation, it is most likely that the problem is related to a missing, inappropriate or faulty third-party mass storage driver:

1. The Windows version does not contain a driver for the target system's mass storage host adapter.

2. An inappropriate or faulty third-party driver was added to the "textmode" part of the unattended Windows installation.

3. A third-party mass storage driver was added via "textmode", but the target PC's system disk requires the "standard" IDE driver.

http://www.deskdecode.com/how-to-fix-blue-screen-stop-error-7b-stop0x0000007b/