Hi,

Check this artical may be help..

Symantec Endpoint Protection: Scheduled scan start is delayed, or scan progress stops or proceeds slowly

http://www.symantec.com/business/support/index?page=content&id=TECH162202

Troubleshooting slow boot times in Symantec Endpoint Protection and Symantec AntiVirus

http://www.symantec.com/business/support/index?page=content&id=TECH106311

Security Response recommendations for Symantec Endpoint Protection settings

http://www.symantec.com/business/support/index?page=content&id=TECH122943

if the machine is shutdown during the scan, it cannot resume the scan from where it let off.

Can't start off from where it left off.

If the machine is shutdown before scan finishes or misses a scheduled scan, you can set an option to scan again after X days

Hi,

I agree above comments you can't be restart scan after system restart.

If you have system slow issue you can check this thread

https://www-secure.symantec.com/connect/forums/scanning-1

It appears that most of the tuning options deal with time slicing with other tasks. I run the scan on a quiet machnine so this does not help. Seeing as scans can run into hours, I find it remarkable that a user cannot shut down their machine and resume the scan at a later time.  I will check with our computer department and see if there is another product for this purpose.

Thanks for the posts-

Fritz