Installation: "Error opening file for writing"

[fuzzy_umbra]

The installer asks for a directory to unpack files to, defaulting to a directory on the desktop. I accept that directory. It immediately shows:

Error opening file for writing:
C:\Users\(me)\Desktop\OpenOffice.org 3.4.1 (en-US) Installation Files\openofficeorg1.cab

I'm using Windows 7 Ultimate Service Pack 1, 64 bit, 6 GB RAM, Intel Core2 Duo 3.06 GHz. There are other posts mentioning this error, but the suggested solutions don't seem to work. I've tried to anticipate the questions that will be asked:

Windows is activated.
I have a healthy internet connection.
I shortened the directory name to have no spaces. (e.g. C:\Users\(me)\Desktop\unpacked)
I am an administrator.
I right clicked > selected run As Administrator and also right clicked > Properties > Compatibility > checked "Run this program as an administrator".
I ran in compatibility mode for Windows 7 and Windows XP SP3.
I have permission to write to that directory; I created a text file in it after the error.
I have 278 GB free on C:.
I have downloaded three times from openoffice.org and checked the md5 sum.
I disabled (even uninstalled) antivirus and my firewall.

java -version returns:
java version "1.7.0_05"
Java(TM) SE Runtime Environment (build 1.7.0_05-b06)
Java HotSpot(TM) 64-Bit Server VM (build 23.1-b03, mixed mode)

I have run these other installers with no problem:
Chrome, Firefox, various drivers, Gamefly, VMware Workstation, Photoshop, Acrobat, Lightroom, Cygwin, Minecraft

Any ideas? Thanks.

[Bill]

Create a new administrator account and install using that account.

[fuzzy_umbra]

Odd...that worked. Windows shows that I am an administrator, and using the new administrator account I created, I double checked that my first account is shown as an administrator. Do you know why that worked?

Thanks!

[Bill]

Have you ever renamed your original administrator account? Renaming accounts can cause problems, but I don't know if it's the cause of this particular problem.

Renaming a User Account Does Not Automatically Change the Profile Path

[fuzzy_umbra]

Nope. It's a fairly new, fresh, vanilla install of Windows 7. Curious.