If an antimalware program finds a suspicious file, that file is usually placed in quarantine to give the computer owner an opportunity to determine if the file is a danger or not. (As opposed to known malware which is usually removed right away with no action required by the user.)
Quarantined files are the files that are suspected as infected by a Malware Detection Program and placed in a special zone that is isolated from the rest of the computer so that these files do not infect the other non-infected files. This special zone is called quarantine by most programs or the vault by some of them.
The quarantined files can be safely deleted.
My Computer
Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 Pro with SP1 32bit
Motherboard
Intel D845GVS1 X86-based PC
Memory
2 gigs of RAM
Graphics Card(s)
Intel(R) 82845G/GL/GE/PE/GV Graphics Controller
Sound Card
Realtek AC'97 Audio
Monitor(s) Displays
Samsung SyncMaster 931BF Black 19" LCD Monitor
Screen Resolution
1280X960
Hard Drives
1. SAMSUNG SP0822N ATA Device ~ 80 GigaBytes
2. Seagate FreeAgent Go USB Device ~ 500 GigaBytes