A few days ago my laptop started behaving odd after I logged in. I scanned it for viruses but the problem was still there. So this is what I did:
I booted up my laptop from the Dell Windows XP OS CD that came with it.
I see the blue screen that says "Windows Setup" at the top with the gray bar at the bottom that says "Setup is loading files... "
Of the three options I get, I choose the option "To setup Windows now, press Enter", then I accept the end-user agreement.
The first time I did this, it copied the files it usually copies, and then asks me what I want to do. I tell it to repair the already-existing WIndows installation. It does all it has to do an then I see the more user-friendly WIndows installation screen that tells me how long it will take to install.
It tells me it will take 39 minutes to install and almost immediately I get a messagebox with message "Fatal error: Setup failed to install the product catalogs. I click OK and I then get error "The signature for Windows XP Professional Updgrade is invalid. The error code is 800b0100".
So after I try this, Windows doesn't let me log on normally of in safe mode. Everytime I turn it off and back on I automatically get the "Setup is being restarted..."
I tried renaming directory catroot2 to catold (http://support.microsoft.com/default.aspx?scid=kb;EN-US;q307153
) but that doesn't work.
What else can I do? I cannot go into safe mode and I cannot start up WIndows normally. I wanted to back up some stuff, but I don't want to do it via the command prompt.
I have WIndows XP Pro SP2 (not an upgrade) and it's the same exact copy that came with the laptop when I bought it. I haven't installed any new software. This is the first real problem I've had in a long time.
Any help is appreciated.