Ok...
You can't restart system until 3 weeks but why you want to disable tampar protection ?
If you want to disable Tamper Protection try to change registry entry ..
Start > Run > regedit
Click OK
Browse to:
HKLM\SOFTWARE\Symantec\Symantec Endpoint Protection\AV\Storages\SymProtect\RealTimeScan\Disabled
By default, Tamper protection is enabled and ON.
This will be shown as Disabled REG_DWORD 0x00000000 (0)
Disabled = 0
For disabling Tamper protection (OFF), edit the registry value and set it to 1
This will be shown as Disabled REG_DWORD 0x00000000 (1)
Disabled = 1
Steps to change this registry value:
Right-click [Disabled] and select Modify
Change Value data from 0 to 1