DOCUMENT:Q113163 21-NOV-1999 [msdos] TITLE :CPAV Reports COMMAND.COM Infected with Unknown Virus PRODUCT :Microsoft Disk Operating System PROD/VER:MS-DOS:6.2 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft MS-DOS operating system version 6.2 ------------------------------------------------------------------------------- SYMPTOMS ======== When you run Central Point Anti-Virus (CPAV) version 2.1 prior to running MS-DOS 6.2 Step-Up and then run it again after running Step-Up, CPAV reports the following message: File COMMAND.COM is infected by an unknown virus The virus size is 1,694 bytes Infection type is End COM Clean, Continue or Stop NOTE: CPAV may also report the above error message for the file TREE.COM. Central Point Anti-Virus version 9.0 has also exhibited this behavior. CAUSE ===== According to Central Point Technical Support, this error is not actually caused by a virus. Central Point Anti-Virus detects a change in the file size of COMMAND.COM and reports "unknown virus" based on this change. The "virus" size is 1,694 bytes, which is exactly the difference in the size of MS-DOS 6.0 COMMAND.COM and MS-DOS 6.2 COMMAND.COM. WORKAROUND ========== According to Central Point Technical Support, you can work around this problem by choosing Stop when the above message appears. Next, delete the SMARTCHK.CPS files from the root directory and the DOS directory; or, delete all SMARTCHK.CPS files on the drive (to do that, choose Delete Smartchecks from the Scan menu in CPAV. Then, run CPAV again. MORE INFORMATION ================ For more information, contact Central Point Technical Support. Central Point Anti-Virus is manufactured by Central Point Software, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability. Additional query words: 6.20 9.00 ====================================================================== Keywords : Technology : kbMSDOSSearch kbMSDOS620 Version : MS-DOS:6.2 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.