Re-install of Win XP will be starting from scratch. Yes, you'll lose it all.
When did this start? Did you install a particular program or device? If so, do a system restore. This solves 90% of the problems which are most often driver related.
Also, the 12:30 issue suggests that something is running at that time. Did you check 'scheduled programs'? Some resource hog (like anti-virus) may be running at 12:30 PM instead of AM.
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