i will not ask help this time. i think at first i destroyed linux 7 but i ran it!
 
here is what i did. it is wrong i think but i woked it!
 
1 - i install new version of glibc and it says it need another file glib-common.
2 - i downloaded another file from rpmfind
3 - i install both new files but it says it has errors that old one conflict
4 - it also says dependency problems
5 - i remove old glibc and other file and install glibc and no errors
6 - linux will not start!!! many reboot
7 - i was in fear!
8 - i put the linux cd copy and chose upgrade!!!
9 - i forgot what i clicked in the setup. but i chose some extra options i discover
10 - linux starts!!! yehey!
11 - i try to check and install new glibc again.
12 - linux says it is intalled already so i do not install it again.
 
now i get to install new rpm new xcdroast version and more!!!.
he he he. now to make xcdroast to run
 
im sure it is not the proper way to go about it and scared me also but it work!