Step:-1
Click on Start >> Run >> regedit >> Click OK
Then Go to
HKEY_LOCAL_MACHINE >> SOFTWARE >> Microsoft >> WindowsNT >>CurrentVersion >> SystemRestore. Look for DisableSR on the Right side if you find it Right Click on it Click Modify and make sure its set at "0"
If a "DisableSR" value doesn't exist, go to the Edit menu, select New, DWORD
value, and create the value.
Set the value to 1 to disable System Restore or 0 to enable System Restore.
Exit from Registry and restart the computer now you should get the System Restore Tab back
Step:-2
Re-Enabling System Restore (WinXP Pro)
If you previously disabled system restore through the Group Policy Editor, the option
to start it again does not show in the System Properties. You can re-enable it again
by:
1. Run the Group Policy Editor (gpedit.msc)
2. Go to Computer Configuration / Administrative Templates / System / System Restore
3. Set Turn off System Restore and Turn off Configuration to Disable
4. Right click on My Computer
5. Select Manage
6. Go to Services and Applications / Services
7. Scroll down to System Restore Service
8. Set it for Automatic
9. Click on the Start button to start the service
10. Close down this window
11. Go back to the Group Policy Editor and configure both to Not configured
12. Now when you right click on My Computer, there should be a tab for System Restore
and you can configure how much space will be used.