A restore point in Windows XP/2000/98/95/Vista, is a back-up marker, created by the System Restore application, which save's data about the PC's settings, installed programs, and some user data. It is generally used when a change in the System (brought on by either installing a new program, getting a virus, or changing a setting, cause instability), then the restore point is called apon, and restore's the computer to the state it was in when the point was created.
A similar function is available in Mac OS X Leopard, called Time Machine, however it requires an external hardrive to function. It's advantages however are that it can restore any action (including the deletion of files) within it's range (it's range being dictated by the size of the External HDD) and also, it requires no user input whilst backing up, as the process is automatic.
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If you goto the restore point section and create a restore point yourself, it should explained if and how long it is saved. You are probably better to use the "backup" tools
If you have enough hard drive space you should always create a restore point.
No it wont. The point of System Restore is to restore your system to a workable state without you having to reinstall the operating system and lose your data files in the process.
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Do you mean "System restore" By default: System restore automatically create a restore point when an Autoupdate installation is performed. Or when you install/uninstall a program with a installer that is System restore compliant. If you want it to create a restore point at regular intervals, you have to manually configure it.
Those installed after the date of the restore point used will be removed.
No - system restore is designed to 'roll back' your computer to a point in time before a problem occurred. It will undo installations, but not restore deleted files.
Basically - you can't. You're better off reverting to the restore-point befor the corrupted one, reinstallinfg any new software, and re-typing any lost data. Once you've done that, create a new restore point after the corrupted one.
All of the points on a parabola define a parabola. However, the vertex is the point in which the y value is only used for one point on the parabola.