Windows Startup difficult

I have XP, SP3, computer pc.HP. 3.00GHz memory and 512 MB of Ram.

When I open my computer, Windows is on the screen it scrolls (bottom band) without ever opening. At shutdown, Windows takes time to close as well.

I can only open Windows by F8 and choosing Windows and start again, now it's the second part it works.

I did a , Ad-Aware, Spybot (updated version), CCCleaner. I am protected by AVG and ZA.
I did a HijackThis and evaluation. No problem.
By: msconfig, I looked at what I had to start to minimize the starts and that can slow down.

The probem has started (not sure) to install the SP3.

How do I resolve my problem? Thank you

If you can remove the sp3 in pheasant restoration system has a date prior to the installation.
If you can not you can try to repair your win xp, it goes back to very early without any update, but you will lose any programs.

Have you made other updates?

If you can and if it is not already made backups of everything that is important on your hard drive!

You do analyzer where the HijackThis log? Because perhaps we would see the problem or software in the kind of Combofix which allows you to see even more.

Dr. V
I have an external backup disk.

I have a small notebook where I write whenever I install software or nvle version. That was in August ... I lose all the work to update all my software ... hum ...

Birdie
I did do an analysis on the site of HijackThis.
I do not know Combofix? What?

Thank you for your answers ..