It doesn't - unless you've set a schedule. The 'default' is Wednesday mornings at 1am - which is pointless because the computer cannot defrag the drive while it's switched off ! You would normally set the defrag program to run at a specific time and day which suits your needs. You can set it to run daily, weekly or monthly at whatever time is suitable to you.
Monthly
You should defragment your drive at least once a month to keep it running smooth and clear out unneeded items.
A Windows virus scan is not performed automatically if one does not configure it to scan a Windows computer automatically. An antivirus is protecting you automatically from opening a infected file.
Yes, they are often launched automatically when Windows detects a problem.
As frequently as Windows does on a PC.
Windows explorer automatically updates whenever Windows has a critical update. Computers should have Windows update activated to ensure a smooth update experience.
It shouldn't be necessary to defragment more than once a month, unless you are adding a lot more files, etc. to your computer. If you notice it begin to go more slowly, that is sometimes an indication you may need to defragment more often.
When a system restore point is created. Actually the Windows Registry is backed up daily if System Protection is turned on.
By default, Windows automatically defragments magnetic hard drives once a week. The system schedules this task to optimize disk performance by rearranging fragmented data for more efficient access. Users can adjust the schedule or manually initiate defragmentation through the Disk Defragmenter tool in Windows. SSDs, however, are not defragmented as frequently, as they use a different optimization method called TRIM.
A computer makes system restore points quite often. It ranges from when you install/uninstall programs, to just logging onto Windows.
Often in order to be able to hear their surroundings.
On Windows Vista, the CD drive is typically accessible through "Computer" or "My Computer." You can find it by clicking on the Start menu and then selecting "Computer," where the CD/DVD drive will be listed alongside other storage devices. It is usually labeled as "DVD RW Drive" or similar, depending on the type of drive installed. You can also access it directly from Windows Explorer by navigating to the appropriate drive letter, often labeled as D: or E:.