I can't install symantec. Every time I try it says it has been interrupted.
Can you please provide the product and version that you are installing? I can then put your post in the correct product forum for higher visibility.
Naviate to %temp% and look for the SEP_INST log. Post it here so it can be reviewed.
Go to start and type Run
In Run window type %temp%
Look for a file called SEP_Inst.log
In the log file search for Return Value 3
Copy and paste 6-7 lines before this line
Get all the instance of Return Value 3
The error you are stating is generic and nothing can be understood from that..For any installation issue always post the SEP_INST.log file