What does system restore can do?

System Restore is a component of most of the operating systems of Microsoft, like Windows XP, Windows Vista and Windows 7 that allows for the rolling back of system files, registry keys, installed programs, etc. to a previous state in the event of malfunctioning or failure.
A limitation which applies to System Restore in Windows versions prior to Windows Vista is that only certain file types and files in certain locations on the volume are monitored, therefore unwanted software installations and especially in-place software upgrades may be incompletely reverted by System Restore. Consequently, there may be little or no practical beneficial impact. Certain issues may also arise when attempting to run or remove that application. In contrast, various other utilities have been designed to provide much more complete reversal of system changes including software upgrades. Frequent or continuous monitoring may also adversely affect system performance, whereas System Restore's restore points are generally created quickly and sparingly.
If there is no adequate free space, System Restore will fail to create a restore points. In this case, the user may discover that there is not a single restore point available with which to restore the system.
It is not possible to create a permanent restore point. All restore points will be deleted after a few days as allotted disk space is consumed by automatic restore points. Consequently, if a user does not notice a new problem within a few days, it may be too late to restore to a configuration from before the problem arose.
For data integrity purposes, System Restore does not allow other applications or users to modify or delete files in the directory where the restore points are saved. Since its method of backup is fairly simplistic, it may end up archiving malicious software such as a virus, worm or other types of malware. In this case, the anti-virus software may be unable to remove the infected files. The only way to delete the infection is to disable System Restore, which will result in losing all saved restore points, or simply wait until Windows deletes the older restore points. Moreover, if an infected set of files is restored, the virus may end up getting restored as well.
Changes made to a volume from another OS (in case of dual-boot OS scenarios) cannot be monitored. Also, a compatibility issue exists with System Restore when dual-booting Windows XP/Windows Server 2003 and Windows Vista or later operating systems. Specifically, the shadow copies on the volume are deleted when the older operating system accesses (and therefore mounts) that NTFS volume. This happens because the older operating system does not recognize the newer format of persistent shadow copies.
System Restore is not 100% safe. After the process, sometimes we cannot restore the file we need or even lost some other files like photos, videos, etc. At that time, you can try to use a good data recovery application or call the professional data recovery experts.

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