When you have Windows computers incorrectly scanned as a NAS, this would mean that at some point in the past port 135/TCP was blocked on these Windows computers during a scan. If you have both a Windows and a NAS copy of the asset in question, this means that the firewall issue is either intermittent or already resolved. Unfortunately it won't be possible to merge these NAS assets with their related Windows computer assets, so the only option is to
delete the incorrectly identified NAS assets.
If there are no latent firewall issues, the NAS assets should not be recreated again after deletion.