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.
Normally it doesn't defrag itself. So you will need to do it yourself if you want it to. to do that you will need to go to search bar and type defrag or disk defragmenter to be precise. Then you can change settings to be schedule so it automatically do it daily, weekly or month, or you can just do it manually every time.
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.
When a system restore point is created. Actually the Windows Registry is backed up daily if System Protection is turned on.
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.
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.
No it's not. It keeps perfomance of your system on a very good level. But if you don't copy, move delete big amount files you don't need to defragment your hard drives more then 1 time per month.
Often on a CD or a DVD there is a file called autorun.inf This file will run when the DVD or CD is inserted into the drive, and it will run a menu or an installation setup.