This reminds me of an old MSDOS virus that modified your FAT disks such that only computers infected with the virus could read the disks! So people with infected computers would reach the conclusion that there was something wrong with the un-infected PCs. Then they might offer their boot disk to the owners of un-infected PCs - "Try this... If it works, there's something wrong with your DOS disk"... And the whole cycle repeats:-)
Do you remember what this virus was called? Perhaps there were many that used this strategy.
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This reminds me of an old MSDOS virus that modified your FAT disks such that only computers infected with the virus could read the disks! So people with infected computers would reach the conclusion that there was something wrong with the un-infected PCs. Then they might offer their boot disk to the owners of un-infected PCs - "Try this... If it works, there's something wrong with your DOS disk"... And the whole cycle repeats :-)
Do you remember what this virus was called? Perhaps there were many that used this strategy.