[damianwalters]

Some say to do a clean boot (see below) and try the install again. Let's hope ...

To enter clean boot mode on a computer, follow these steps:
1. Click Start, type msconfig in the Start Search box, and then press ENTER.
2. If you are prompted for an administrator password or for confirmation, type the password or click Continue.
3. On the General tab, click Selective Startup.
4. Under Selective Startup, clear the Load Startup Items check box.
5. Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All.
6. Click OK.
7. When you are prompted, click Restart.
8. Try update your computer again.