Simple, you got virus on the other drives of your Hard Disk.
My suggestion, clean install Windows 7 completely over again on Drive C,
Dont use any apps or files from other drives.
Fresh download the latest Bitdefender Total Security or GData.
Install Malwarebytes & Update.
Do all these with freshly downloaded files via internet.
Remember, you must keep the files on the other drives untouched, i mean never click on the other drives until this is complete
Do a scan with Malwarebytes, and the AV you installed on those other drives,
Remove those viruses and vola, your done

And yes, if you dont want the data on any of your partitions on your HDD, then format everything and fresh install - Simplest way