Resolution:
Check Date and time
Install Windows OneCare on a Clean boot environment
Check third party applications like Firewall, AV, Dial-up accelerator and Parental Controls
Check proxy settings and disable the "Automatically Detect Settings" option in Microsoft Internet Explorer
Check if you have third party application like norton, mcafee etc.
Register the following .dll files.
Open Command prompt (Elevated mode in Vista) and enter the following command lines:
REGSVR32 urlmon.dll
REGSVR32 jscript.dll
REGSVR32 wintrust.dll
REGSVR32 cryptdlg.dll
REGSVR32 softpub.dll
REGSVR32 initpki.dll
REGSVR32 dssenh.dll
REGSVR32 rsaenh.dll
REGSVR32 gpkcsp.dll
REGSVR32 sccbase.dll
REGSVR32 slbcsp.dll
REGSVR32 msxml3.dll
REGSVR32 vbscript.dll
REGSVR32 mssip32.dll
Note: Some of the files may not register in Vista these are: initpki.dll, gpkcsp.dll, sccbase.dll, slbcsp.dll
Verify HTTP setting in Internet options
Open Internet Explorer.
Click Tools -> Internet Options.
Click the Advanced Tab.
Remove the check from use HTTP 1.1.
Place a check in Use HTTP 1.1 through proxy connections.
Attempt to install OneCare again.
If you are still experiencing difficulties, try having both HTTP 1.1 and HTTP 1.1 through proxy connections checked.
Create a new Admin profile and attempt to reinstall Windows OneCare
Try to do a Power Cycle of the modem/router and the PC.
Try connecting directly to the internet by bypassing any type of router or hub
-PAUL
