Executable adservice.exe is a special tool, known as Active Disk Service. It is included in Iomega Zip drivers. Running adservice.exe detects inserted Zip disks and provides functions, required to launch special software from these media. Although it is hard to find disks with such software in our days, you should not remove adservice.exe from the system.
verdict - status of the file:
• Plumbytes Anti-Malware
• Malwarebytes Anti Malware
• Hitman Pro
• Webroot SecureAnywhere AntiVirus