problem with asset scanning

I've sent this to the support team but no reply yet.
I'm hoping I can get some luck in this forum.

Client – win 7 Pro 64-bit
Scan error:
No response received from workstation. Probably the workstation might be switched off or does not exist.

The workstation:
-    Firewall disabled
-    UAC disabled
-    Can be ping-ed from the SDP server
it has static IPv4

Also tried to change the DCOM settings to DEFAULT and IMPERSONATE as suggested by troubleshooter but still no luck.
Another workstation (same make/model) has the same firewall/UAC/DCOM configuration and it can be scanned just fine.

This same workstation can be scanned by AssetExplorer on a different server.

Any advice is appreciated.