Okay so I've been using CCleaner, Speecy, Defraggler I installed nforce and GFX card latest drivers and after restarting whenever I run Defraggler it freezes up my system not even the window opens. I have re-installed it 3-4times and restarted many times but its of no use. Its only happening in Defraggler, CCleaner is working fine.
P.S. i used two registry tweaks but not related to Defraggler.
FIRST:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\nvata
DWORD: DisableRemovable=1
SECOND:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\CDRom
DWORD:AutoRun=1
THANKS!