Something is running on every partitions ... Virus infected?

When I remove an unused partition, it shows following error message, and I get no idea what is using it, which is simply 64mb empty space.

 

Not able to finish, because partition is opened or being used, it could be set as system, bootup, virtual memory or keep a damage printed file.

Partition (T:) is being used at this moment, if you force to remove this partition, please press Yes
Warning: force to remove may cause the application using this partition error accidently, do you want to continue?

 

After I force to remove it, and create a partition (T:), I remove it again for testing, there is no error message, it seems strange on this partition, does it have any hidden activity on it?

 

I install a clean XP, and recreate each partition, and test each partition by removing and recreating them, there is no warning message, but after I connect to my old HDD, which keep the backup, then I try to repeat above test procedures by removing and recreating any partition, it shows above warning message again.

 

Does anyone have any suggestions on what is going on? Does anyone know any virus performing this behaviours?

Thanks in advance for any suggestions :>