Windows registry error

[crashit42]

Hi new member need a little hepl

I get a window encountered an error accessing system registry and will reboot and restore a good reg sys. This happens everytime i try to change a setting or upgrade a program.
Win98sec clean install on
Gigibyte mb
350 amd k-6
160mg ram
ati video card rageIIC
wd 13 gb hard drive
win98sec
Thanks Harry