They do have a fix for it now, which involves upgrading to Update Rollup 2 (UR2). Unfortunately, you might not be able to upgrade right away. As a workaround, I wrote the powershell script below that will cleanup the old definition files. I schedule this to run daily.
########################################################
## Cleanup old Symantec Definition files
## http://NerdsKnowBest.blogspot.com
## Always evaluate any script before use.
## Caution: Use at your own risk.
## No warranty expressed or implied.
## Written by: Greg Kjono on 12/14/2012
########################################################
$version = gwmi win32_operatingsystem | select version
$version = $version.version.substring(0,4)
$ErrorActionPreference = "Continue"
c:
## Set the definition path based on the OS version
if ($version -ge "6.0."){
## >=W2k8
[String]$dir = 'C:\ProgramData\Symantec\Symantec Endpoint Protection\12.1.1101.401.105\Data\Definitions\VirusDefs'
}else{
## <= W2k3
[String]$dir = 'C:\Documents and Settings\All Users\Application Data\Symantec\Symantec Endpoint Protection\12.1.1101.401.105\Data\Definitions\VirusDefs'
}
## Get directory list
$dirs = Get-ChildItem $dir | Where {$_.PsIsContainer -and $_.Name -match "^201"} | Sort-Object Name -Descending
## Identify the most current definition(s)
$Current = $dirs[0].Name.substring(0,8)
## Remove the older definition files
Get-ChildItem $dir | Where {$_.PsIsContainer -and $_.Name -match "^201" -and $_.Name -notmatch "^$Current"} | Remove-Item -Recurse -Force
Please evaluate the script for your systems/environment. Use at your own risk.
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