Is a system on which CHKDSK reports 639K (or less) total memory infected ?
If CHKDSK displays 639K total memory then it is probably due
to reasons other than a virus since there are very few viruses
which take only 1K from total memory. This can be due to
- A IBM PS/2 computer, which reserves 1K of conventional RAM for an Extended BIOS Data Area.
- A computer with AMI BIOS, which uses the upper 1K of memory. (However, it can be instructed to use lower memory).
- A SCSI controller.
If you do not have any of the above mentioned setup OR if you are
missing 2K or more of RAM, then there is a chance of viral
infection.