Bluephoton
OK in case it is not clear to you, and as you seem to be in bother, as I see it here is what you need to do.
Boot up to the sme install CD in rescue mode. Carefully follow the wiki instructions re this here
http://wiki.contribs.org/Bootingie
You can use the function keys F1 to F5 to get more information about different boot options or type
sme rescue
or I think you can even select that mode from the screen
Follow the on screen suggestions re mounting your system and so on.
When you are at a command prompt, you can then follow the instructions in the Certificates Concepts wiki article here
http://wiki.contribs.org/Certificates_Concepts#Expiration_time_of_the_self_signed_certificateto restore default self signed certificate.
Also follow the instructions carefully to the letter, no deviation (except using correct names for your system).
ie
rm /home/e-smith/ssl.crt/servername.domain.com.crt
rm /home/e-smith/ssl.key/servername.domain.com.key
rm /home/e-smith/ssl.pem/servername.domain.com.pem
signal-event post-upgrade
signal-event reboot
Replacing servername.domain.com with your server & domain name.
do for each folder name
cd /home/e-smith/ssl.crt/
ls -al
to list the file names
Then when your server reboots OK, (assuming it does), you can fix your file access issue, using my suggestion in the other thread. Ask again if you want me to elaborate on the commands.
Then you can update your server to 7.4 using the server manager panel.