Question is too widely to specifics problem. Please collect exists problem or any print screen detail to analysts .
Customer trying to install by themselves. As We had known customer have all windows 7 professional edition and has not a domain.
And we have been sent SEP client installer software to client for install.
Please check
1. be assure user installed with correct client software which wasn’t SEP Manager installer.
2. Is They have enough disk , memory.
3. Is They Have sufficient permission for installed.
4. Is The OS compatible. (minimum requirement is below email)
5. UAC are disable.