Most likely the X250 device requires a software update to 3.5.0.0 to resolve this issue.
Please contact [email protected] for the update link.
In some rare cases, the Malware Scanner on X250 shows this error when the DAT file was previously downloaded incorrectly. In this case, the steps for a workaround are listed below.
NOTE: You are required to end the AVmalwarescanner process in Task Manager in order to complete the following process.
1. Click on the Files folder from Control Panel
2. Open x:\Device-System-Files\MalwareScanner\dats
3. Delete all dat files
4. Click Settings from Control Panel
5. Navigate to Tools - Device Health section
6. Click Restore Onboard Apps
7. Select Malware Scanner - click OK
8. Click Ok on the confirmation message.
For more information related to the Anti-malware loading error, click here.