System Restore points disappear after 1 day

Microsoft Windows XP

I recently noticed that my System Restore points are no longer available after 1 day. Yet, the RPLifeInterval is set to 90-day default. Is there another registry value that could cause this situation? I believe this problem began concurrently with a hijacking search page that I have apparently removed, but I still lose my restore points. Mucho thanks in advance.
First follow #1, #5 & #6 on this page to get rid of spyware and
viruses:
http://www3.telus.net/dandemar/slowcom.htm

Many things can cause loss of Restore Points, when they are gone, they
are gone and can not be recovered or used.
Some of the things are:
Available space on hard drive
Computer usage
Space you dedicate to System Restore

If you use Real Player, try doing without it for a few days:
http://support.microsoft.com/?kbid=812119
And others.
Thanks, Jupie. It appears that it may be the RealOne Player connection.