Install CI in client server and getting blank page

[eluser]orfaust[/eluser]

fatal error: require() [function.require]: Failed opening required 'system/codeigniter/Common.php'

It seems CI has not the permissions to read its files.

If you have ftp access you may be able to change directories and files permissions, but be careful, don't touch them if you don't know what you're doing.
I can't help much with windows server permissions, try asking the host provider.
Or someone else here...

good luck