My computer was shut down over the New Years holiday. I'd even
unplugged it. Monday night I rebooted and everything seemed fine.
Then, I launched Microsoft Outlook and tried to read an e-mail message.
The computer screen flickered bright blue and the machine crashed.
It tried to reboot. But it won't. I can boot into safe mode, but not
otherwise.

I did absolutely nothing to cause this. The machine was fine the last
time I'd used it, and then this happened. Now I can't get Windows XP
to run properly. Would reinstalling the OS help? Can I do that
without the risk of losing data? Should I do it? If not, what should
I do?

Thanks.