Download this drivers (compatible with 32-bit and 64-bit). Download
Extract the driver file, we will need it later.
1. Open device manager. (guide to open device manager with pictures here).
2. Right click on SCSI Controller and select update driver. (The SCSI is listed under other devices and should be visible once you open device manager).
3. Click Browse and point to the driver folder we extracted earlier.
(During installation, a warning will pop-up, ignore it and continue anyway).
4. Continue installation until finish.
If the driver above does not work, use this MOD driver which support most of the adaptec SCSI adapter:
Download (SCSI MOD)
Install using the same method above.
Note : If you have the VISTA drivers, it worth to try and install it in compatibility mode for windows Vista.