Given that the drive contained a Windows XP compatible partition prior to the virus removal, it should appear in Computer unless the partition information was somehow corrupted. If the disk does not appear in
Disk Management whatsoever, it may not be detected by the system at all. The next place to check would be
Device Manager, which can similarly be accessed in Windows 8 from the list of administrative tools available through right clicking in the lower left corner where the Start Screen would be launched. Look for the drive hardware to appear under the Disk Drives category. If it does not appear here, the system is unable to detect it for some reason. The next location to detect it would be in the system firmware (UEFI or BIOS).
If the disk appears to the firmware but not in Device Manager, you may need to install your storage controller drivers to allow the operating system to see the disk. This would be more likely to occur if you have a motherboard with additional controllers or an add-on card. If the disk does not appear in the firmware you should double check data and power cables to the drive to ensure that it has power and is, as Primenay13 mentioned, spinning.