You have other issues. It may be a conflict between some security setting in XP and your other progs.
I have both Ad-Aware and Spybot S&D, and I'm running Netscape 7.2, which is an earlier Mozilla build. I've also installed all of these and Firefox on other XP Pro setups, including those with SATA drives, and I've never seen the problems you're having.
Most of the major hangups I've encountered with Ad-Aware and Spybot are on spyware infected machines. It starts at installation. If you can't figure it out, as much work as it is, I'd suggest starting again from the ground up.
When I set up a new I always recommend buying drives in pairs and a moble rack and getting a copy of Ghost. When building, I do this:
NOTES:
DO NOT go online until you have your AV, spyware traps and firewall in place. Then, ONLY go for AV and anti-spyware software.
1. Install the base system and nothing more. No updates and no programs.
2. Install Ad-Aware and Spybot, and scan the drive. They'll find some stuff to delete.
3. Install Zone Alarm (or other firewall of choice).
4. STOP, and Ghost the drive. Do this after EVERY major installation step. It takes only a few minutes, and the next thing you do can't screw the system any more than it can be unscrewed.
5. Install Norton System Works (or your choice of AV and tools).
6. Run everything, nuke the problems, and run Norton WinDoctor or the Registry cleanup tool you prefer. This is important. Keeping your registry clean during the build prevents accumulating problems. NSW and other good tools allow you to undo the changes they make so you can undo any changes that don't work.
I'll refer to NSW in uture repeats of this step. Alternatives of your choice are implied.
7. STOP. Plug in the backup drive, Ghost the drive, and unplug the backup drive.
8. Now, it's finally time to go to Windows Update for critical updates. Get only the first round your system allows. You won't be able to d/l them all in one step.
9. Run everything, nuke the problems, and run Norton WinDoctor. I've never seen a Windows update that didn't require a registry cleanup, and some contain items Ad-Aware or Spybot WILL recognize as malicious files. NUKE 'EM!
10. STOP, and Ghost the drive, and unplug the backup drive.
11. Continue updating Windows.
12. Repeat the full cleanup after every step, and Ghost the drive. If the next installation screws the pooch, you can restore it to the last known good condition in minutes.
Note -- Windows restore points are nowhere near as secure as Ghost. Restore point info is stored on your hard drive, and some viruses attack the restore point files. There is no malicious software that can jump the air gap so you're always as good as your last known good Ghost copy.
This requires investing a few minutes along the way following each step. You'll appreciate it the first time you run into a problem, and all you have to do is Ghost your last good installation point back to your main drive. 🙂