BTW,

these files are in the all users\application data folder . . .

I'd love to get an answer to this question too. For example, the C:\Documents and Settings\All Users\Application Data\Symantec\Cached Installs\ directory is becoming entirely too large. Over 1GB ? That's seems a bit unreasonable especially for a bunch of files that in all likelihood are not needed any more.

Thx! 

I manually removed the contents of that Cached Installs. After reboot, Symantec is taking a LOT of time to 'repair' things and then all this useless crap files are back again!! Indeed, about 1GB of useless files there. I think this will grow rapidly as we will install more software (and we will... i'm working at a school. where it's not strange to have installed 75 programs or more).
This is totally unacceptable behaviour and consuming up valuable server harddisk space (for all the images - we keep multiple images per machine type so we can go back in time at different points). Say we have 7 different PC's and keep 10 different images per machine. That's 70GB of useless files in the images on the expensive SCSI harddisks. At the moment, we only have 58GB disk space IN TOTAL!!

We NEED to have different images per machine.
In our situation there's really no use for caching those files anyway, since we grab an image if a PC really WOULD get malware.

It might be that Symantec caches it too boost performnace (instead of keeping them as backups). In that case: it's doing more harm than good.
If Symantec doesn't offer an easy solution to this really bad behaviour, we will need to end our contract (650 PC's) and we will take some other scanner (maybe NOD32).

Please Symantec... Tell me where/how to disable those ridicilous Cached Installs folder. The interface should have an easy to find button to stop this. It doesn't.

Is this what you are looking for ??? :)

http://service1.symantec.com/support/ent-security.nsf/854fa02b4f5013678825731a007d06af/ae142cf6efe920cf88257376005f1474?OpenDocument

and

http://service1.symantec.com/support/ent-security.nsf/854fa02b4f5013678825731a007d06af/10a0c9e2f3e845ef882574cf00800eb8?OpenDocument

cheeers ... :D