Black screen after logging on

[STATER]

Hi guys

A week ago I upgraded my CPU from Intel C2D E6300 to E8500. My brother tested over clocking combinations on his account on my PC while I was away. When I returned and tried to log on to my account I got a black screen. I could move my cursor though. CTRL-ALT-DEL and other keyboard shortcuts have no effect. So basically, I have to restart with the button. Strange thing is, I can enter my brother's account and it works fine. I can also log in to my account when using Safe Mode.

Tried everything like restoring from disk, reducing overclock, removing E8500 drivers and re-installing them. Nothing works.

Specs:

Motherboard: Asus P5Q PRO
CPU: Intel C2D E8500
GPU: Leadtek GTX260 Extreme plus
PSU: OCZGXS600w + Thermaltake Power Express 250w(for my hungry GPU)
RAM: 2GB Corsair dominator DDR2 1066mhz
Windows 7 Ultimate 32 bit

This problem is very frustrating so any help will be appreciated.

~STATER

 

[kucing13]

boot like normal. open task manager>run >cmd>type sfc/scannow

and to make sure if your explorer.exe is okay,you can do the same ,task manager>run >explorer.exe

 

[STATER]

boot like normal. open task manager

Can't access Task manager

 

[kucing13]

im sorry i thought your Ctrl+alt+del is still working.

then you can boot in safe mode(f8) with command prompt then type sfc/scannow

 

[STATER]

Yep, here are the results

 

[kucing13]

upload the log file. compressed it in zip. If you're still in safe mode with cmd,type explorer.exe and then hopefully windows explorer will reappear back..after that you can locate the logfile based on the path given

 

[STATER]

Just to be a bit more clear, I can see my desktop in safe mode, i can launch programs such as explorer but if i log in without safe mode my screen looks like this:
note: cursor is moveable

 

[kucing13]

if that's the case try doing the system restore first
if have windows disk with you.try doing repair install