… okay obviously the question is not from me but from someone in the French section. Honestly I have no idea what causes that so I can’t help the guy. He’s saying that he can boot in safe mode, and when he uninstall Avast from there, his problem disappears ;D
With Avast installed and attempting to boot in normal mode, his system reboots as soon as the XP logo appears.
Any idea?
Did he have any other AV installed prior to Avast?
This looks very suspicious.
I’ld recommend my favourite: a MBAM scan first.
yeah he didn’t mention any misbehavior of the system when Avast is not installed, so I didn’t tell him about an mbam scan, but okay you never know, I’ll tell him 
If what Zyndstoff mentioned doesn’t get it maybe you could have him uncheck “Automatically Restart” on system failure to see if this would stop the reboot. Or have Avast load late in the expert settings. Doesn’t solve it but may narrow it down. Check to see if there are any dump files that can be submitted. See if there are any errors in the event viewer??? That’s all my beady little brain can come up with for now.
example I attached is from windows 7 but anyway…
he didn’t mention any bsod. The setting you mention is only effective with blue screens. His system just seems to be caught in an infinite loop at boot time. But yeah, event viewer could talk. I’ll see what comes out of his mbam scan, and suggest different things… well, as soon as he comes back to the forums.
on second thought this may work… I’ll suggest it
HEY I HAD THE SAME PROBLEM AS MENTIONED WITH AVAST 6.0.1000 . PRIOR TO THAT VERSION I HAD NO PROBLEMS WITH MY XP. WHEN I INSTALLED IT SYSTEM WILL RESTART IN NORMAL MODE. BUT I COULD LOGIN IN SAFE-MODE ALSO AVAST FAILED IN NORMAL MODE. THEN I UNINSTALLED THE SOFTWARE IN SAFE-MODE THEN SYSTEM RETURNED TO NORMA. HAD SOME BSOD ERROR WHILE RESTARTING.
WHEN I INSTALLED OLDER VERSION THERE WAS NO PROBLEM… I THINK THE PROBLEM WAS WITH THE SOFTWARE. I HAD THIS AFTER FRESH INSTALL OF XP.SO NO MALWARE OR VIRUS PROBLEMS COULD CAUSE IT…
DONT NO THEY FIXED THE PROBLEM WITH THE NEW VERSION… 6.0.1091
@ullas
What service pack is your fresh install of WinXP? SP2 is required as a minimum. From an OS security standpoint, SP3 is definitely recommended.