Windows update won't update and more

[Alice]

I have a few problems. I am running Windows XP Home on a
HP Pavilion 751n.

I can't seem to run anything through the internet e.g.
Windows Updates; Java Machine install; Norton Online Anti-
virus scan; Microsoft Security Patches...

I am getting error messages about Windows Installer.

Norton Online Anti-virus and the others, I'm not getting
any error messages, just won't run.

I don't know if they are all related or not.

Is there a way of "reinstalling" the Windows Installer?

I suspect either a virus or a registry problem. What is
the command to fix the registry within Windows XP?

 

[Taurarian]

Alice, here's some information and links to consider:

To unregister and re-register Windows Installer:
Click Start, and then click Run.
Type in the Open box: msiexec /unregister and then click OK.
Click Start, and then click Run.
Type in the Open box: msiexec /regserver click OK.
Type commands exactly, including the space between c and /.

This will not affect programs which use Windows Installer that are already
installed.

or

Windows Installer error
Go to Start/Run and type: regsvr32 msi.dll
then
Go to Start/Run and type
SFC /SCANNOW
Make sure you have your WinXP CD in the CD Drive before executing the SFC
command.

or

Windows Installer Fix (Line 94)
http://www.kellys-korner-xp.com/xp_tweaks.htm

Troubleshooting Windows Installer
http://www.kellys-korner-xp.com/xp_w.htm#xp_wininstaller

http://www.kellys-korner-xp.com/xp_w.htm
and scroll down to: "Windows Installer" - download and run the "WI.zip"
file.