PowerBook keeps logging itself off

I have had my 12-inch PowerBook G4 for 9 months. I'm currently having problems in which the PowerBook quits all applications, restarting itself and asking me to login. Any data which hasn't been saved beforehand is lost. I've heard that this may be a means of virus protection on Macs, but this process is now happening about 6 times a day for me, which is very time consuming and irritating.
Does anyone have any idea as to what the problem is, and if so, how to resolve it?
4 months ago my computer crashed (and I lost everything) when I updated programs. Could the current problem be related to this? I can't afford to lose any work again.
Many thanks,

WElcome Harlan,
FIRST of all: do a backup of everything which you want to keep. don't do it now, do it YESTERDAY !!!
include you rdocuments, photos, music, and so on, but also your applications (if you don't have the original cds).
2) Indeed, if your PB crashed when you updated programs, it could be that you suffer from this still now, for it could be that some of your (system) software is damaged. If this is the case, do the following:
-- back up everything you need;
-- do an "ARchive and Install"
"ARchive and Install" keeps (in principle) everything on your computer as it is, but installs a new version of the system. here is a link for info about it:
http://docs.info.apple.com/article.html?artnum=107120
if this doesn't solve the problem, do an "Erase and Install".
watch out: "Erase and Install" reformats the disk, thus everything will be lost!! the system will be reinstalled on the virgin disk. Your PB should then run as new. if it doesn't, then there is a hardware problem.
By the way, i don't think that this is a virus protection. if at all, it looks like a virus.
and, bytheway # 2: it's a good habit to back up frequently your documents; once a week or so...
Hope this helps. post back, if you need more help.
Thomas

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