On-demand Scan Requirements

Before running On-demand Scan, ensure that endpoints meet the following requirements:

System Requirements

On-demand Scan can only be launched on endpoints running 32-bit versions of Microsoft™ Windows™ operating systems.

System requirements for running On-demand Scan

Resources	Requirements
Operating system	Windows 2000 with Service Pack 4 Windows XP with Service Pack 2 or 3 Windows Server™ 2003 with Service Pack 1 or 2 Windows Server 2003 R2 with Service Pack 1 or 2 Windows Vista™ with Service Pack 1 or 2-RTM build Windows Server 2008 with Service Pack 1 or 2-RTM build Windows 7 (32-bit version)
	If you have integrated Threat Mitigator with an enforcement device, On-demand Scan cannot run on Windows 2000, Windows Server 2003, Windows Server 2008, and Windows 7 endpoints.
Hardware	Processor: At least 133MHz Intel™ Pentium™ or equivalent Memory: 64MB minimum Available disk space: At least 100MB on the system drive (typically drive C:)
Browser	Microsoft Internet Explorer™ 6, 7, or 8
Others	Monitor that supports 800 x 600 resolution at 256 colors or higher

Network/Internet Connection

Network connection is required to send scan queries to the Smart Protection Server you have installed, and Internet connection to send scan queries to the Trend Micro Smart Protection Network.

On-demand Scan will not start if connection to both the Smart Protection Server and the Trend Micro Smart Protection Network cannot be established.

If On-demand Scan has started and connection to both servers is lost, files requiring a scan query are bypassed, allowing users to access the file. This event will be logged and logs will be sent to Threat Mitigator. You can view the logs from the threat event logs. For details about threat event logs, see Threat Event Logs.

Additional Disk Space

The On-demand Scan program downloads a set of files to the following location:

<System Drive>/Documents and Settings/<User Name>/Local Settings/Temp/HCEXEC

On-demand Scan files are not removed automatically after each scan session.

With each successive scan, additional disk space on the system drive is used (unless the HCEXEC folder is removed immediately after a scan) for the following reasons:

Cleaned infected files and other scan-related data (such as detection logs) are added to the HCEXEC folder.
The On-demand Scan program may download newer versions of components, if available from Threat Mitigator.
If another user acount is used to log on to the computer, a new set of files is downloaded to <System Drive>/Documents and Settings/<Other User Account>/Local Settings/Temp/HCEXEC.

If there is insufficient disk space to run On-demand Scan, consider removing unneeded files in the system drive or emptying the recycle bin. You can also delete the HCEXEC folder. However, performing this task deletes scan-related data obtained from previous On-demand Scans.