Error 1646: "Uninstallation of the update package is not supported"

i have not been able update copy of acrobat pro 9.0 since april, though pc tells me every time update available. when try install it, adobe acrobat updater tells me:

 

error 1646: "uninstallation of update package not supported"

 

i have not been able find relevant information on error.

 

any ideas? possible update notification bogus , should ignore it?

 

here's system information machine:

 

available physical memory: 1335328 kb

available virtual memory: 1903884 kb

bios version: hp     - 42302e31

default browser:

default mail: microsoft office outlook

    mapi32.dll

    version: 1.0.2536.0 (win7_rtm.090713-1255)

    creation date: 2011/06/21

    creation time: 6:55:37 pm

graphics card: ati radeon xpress 200 series

    version: 7.14.10.471

    check: not supported

installed acrobat: c:\program files (x86)\adobe\acrobat 9.0\acrobat\acrobat.exe

    version: 9.5.1.283

    creation date: 2012/04/14

    creation time: 8:36:19 am

installed acrobat: c:\program files (x86)\adobe\reader 10.0\reader\acrord32.exe

    version: 10.1.3.23

    creation date: 2012/04/04

    creation time: 1:53:54 am

locale: english (united states)

monitor:

    name: ati radeon xpress 200 series

    resolution: 1280 x 1024 x 60

    bits per pixel: 32

os manufacturer: microsoft corporation

os name: microsoft windows vista

os version: 6.1.7601  service pack 1

page file space: 4194303 kb

processor: amd64 family 15 model 31 stepping 0  authenticamd  ~2188  mhz

system name: my-pc

temporary directory: c:\users\myname\appdata\local\temp\

time zone: eastern standard time

total physical memory: 3209784 kb

total virtual memory: 2097024 kb

user name: myname

windows directory: c:\windows

 

c:\program files (x86)\adobe\acrobat 9.0\acrobat\plug_ins\annots.api

    version: 9.5.1.283

    creation date: 2012/04/14

    creation time: 8:36:50 am

c:\program files (x86)\adobe\acrobat 9.0\acrobat\plug_ins\capture3d.api

    version: 9.5.1.283

    creation date: 2012/04/14

    creation time: 8:37:17 am

c:\program files (x86)\adobe\acrobat 9.0\acrobat\plug_ins\escript.api

    version: 9.5.1.283

    creation date: 2012/04/14

    creation time: 8:36:48 am

c:\program files (x86)\adobe\acrobat 9.0\acrobat\plug_ins\updater.api

    version: 9.5.1.283

    creation date: 2012/04/14

    creation time: 8:36:40 am

c:\program files (x86)\adobe\acrobat 9.0\acrobat\plug_ins\weblink.api

    version: 9.5.1.283

    creation date: 2012/04/14

    creation time: 8:36:40 am

moving discussion acrobat installation , update forums.

More discussions in Installing, Updating, & Subscribing to Acrobat

adobe