Is it possible to reinstall Windows XP without losing my data and disk partitions?

I use Windows XP with Service Pack 2 on my home PC. Due to a recent power outage, the PC got turned off without going through a normal shutdown.

When I rebooted after the power came back, I got a "Windows has recovered from a serious error" message after going through *very* long bootup performing chkdsk and repairing files.

Since then, performance has been absymal and I suspect that some of the OS files had been corrupted by the abnormal shutdown.

I'm hoping that by reinstalling Windows XP, I can solve the problem. However, I don't want to lose my personal data or my hard disk partitions. Any suggestions or links to resources will be really helpful. Thanks!