1. Open My Computer
2. Go to Program Files
3. Search for Unlocker folder
4. Rght Click unlocker.exe
5. On the Compatibility tab check "Run as Administrator"
6. Turn your UAC Settings to High(Maximum)...
7. Restart your PC.
Please make sure you restart your computer after installing unlocker...
Also install .Net Framework 3.5 or 4.0
Link:
If problem still appears...
1. Install Microsoft Visual C++ 2008 Redistributable Package (x86)
(vcredist_x86.exe) - For 32 Bit
Link:
2. Disable your antivirus. - Some antivirus blocks program such as Unlocker.
3. Disable your Firewall. Or add exception on grand chase and unlocker.