Hi Zaza,
Restore points are created by a Windows utility called System Restore
(SR).
System Restore's purpose is to return your system to a workable state
without requiring a complete reinstallation and without compromising
your data files. The utility runs in the background and automatically
creates a restore point when a trigger event occurs. Trigger events
include application installations, AutoUpdate installations, Microsoft
Backup Utility recoveries, unsigned- driver installations, and manual
creations of restore points. The utility also creates restore points
once a day by default.
If you remove all but the most recent restore point, you will loose
the ability to restore the system back past the most current restore
point date. And even if you do, more restore points will created
daily.
What you can do is limit the amount of disk space SR uses if disk
space is limited.
Select Start, then Control Panel and double-click the System icon.
Then click on the System Restore tab on the dialog box. Depending on
your disk setup, do the following:
Single partition: Adjust the space system restore uses on the disk by
moving the slider left to decrease space usage, or right to increase
space usage. The default maximum space usage is 12%.
Frequently Asked Questions Regarding System Restore in Windows XP:
http://www.microsoft.com/technet/prodtechnol/winxppro/plan/faqsrwxp.mspx
Windows XP System Restore:
http://www.microsoft.com/technet/prodtechnol/winxppro/maintain/xpsysrst.mspx
HOW TO: Restore the Operating System to a Previous State in Windows
XP:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q306084