Acrobat XI won't install

I have been trying to install a purchased copy of Acrobat Standard XI on a Windows XP Pro machine and get an error message that says:

" An error occured while extracting some files.  Check available disk space on your computer and the write permissions on the destination folder."

When i click on okay another message pops up that says " A problem occured while extracting the archive.  Pleae try downloading the Adobe Acrobat XI again."

I am an Administrator on this machine.

I disabled the virus protection.

I have uninstalled the free Reader.

I have over 300 gb of free disk space.

I deleted the AcrobatStd_11_Web_WWMUI.exe file and downloaded again.

Help!