1. When it's installed, OneCare assumes responsibility for Windows Update.
2. I suspect you just installed OneCare because you were already having
other problems (and you may not have had anti-virus/anti-spyware protection
before you installed OneCare). These problems are related to your inability
to access Windows Update via OneCare.
There's a very strong possibility that you have a Vundo infection, which is
usually accompanied by ZLOB and/or SDBot infections, all of which are
protected by a rootkit.
Run a thorough check for hijackware, including posting your hijackthis log
to an appropriate forum.
Checking for/Help with Hijackware
http://aumha.org/a/parasite.htm
http://aumha.org/a/quickfix.htm
http://aumha.net/viewtopic.php?t=5878
http://wiki.castlecops.com/Malware_Removal_and_Prevention:_Introduction
http://mvps.org/winhelp2002/unwanted.htm
http://inetexplorer.mvps.org/data/prevention.htm
http://inetexplorer.mvps.org/tshoot.html
http://www.mvps.org/sramesh2k/Malware_Defence.htm
http://defendingyourmachine2.blogspot.com/
http://www.elephantboycomputers.com/page2.html#Removing_Malware
When all else fails, HijackThis v2.0.2
(
http://aumha.org/downloads/hijackthis.exe) is the preferred tool to use (in
conjuction with some other utilities). HijackThis will NOT fix anything on
its own, but it will help you to both identify and remove any
hijackware/spyware with assistance from an expert. **Post your log to
http://spywarehammer.com/simplemachinesforum/index.php?board=10.0,
http://forums.spybot.info/forumdisplay.php?f=22,
http://aumha.net/viewforum.php?f=30, or another appropriate forum for review
by an expert in such matters, not here.**
If the procedures look too complex - and there is no shame in admitting this
isn't your cup of tea - take the machine to a local, reputable and
independent (i.e., not BigBoxStoreUSA) computer repair shop.
==========================================
Start a free Windows Update support incident request:
https://support.microsoft.com/oas/default.aspx?gprid=6527
Support for Windows Update:
http://support.microsoft.com/gp/wusupport
For home users, no-charge support is available by calling 1-866-PCSAFETY in
the United States and in Canada or by contacting your local Microsoft
subsidiary. There is no-charge for support calls that are associated with
security updates.