win xp just reboots over and over and over

i turned the computor off yesterday and all wnet wrong. on rebooting it goes through all the seeking but when it only gets as far as the xp logo and then reboots over again . this does not stop. it will then ask me if i want to start in sfe mode or last know config . i choose the last config and it starts over again rebooting.

i went into safe mode and did a clean up and still the same. this time on rebooting i hit f8 and select last known config and this works and i get into xp ok. why is this happening. windows is up to date

 

It sounds like a driver if causing an error. Check your event log for any warning or critical errors. Update your drivers if applicable.

 

As Far As I Know My Drivers Are Up To Date But Are There Any One That You Are Thinking About In Specific.