Windows 7: Just being incredibly slow...

Just recently I downloaded a game, Battle of the Immortals to be exact, and it was a .exe file. I go into my downloads folder and double click it to start the installer and I get the spinning blue circle that means it's loading right? Yeah well.. it just sits there FOREVER. I just double clicked it in the morning before school and when I came back nothing was on my screen. And now, as I am posting this, my computer is acting very slow. My computer is custom built and I've had it for about 4 months now and I haven't had any kind of problems with this thing being slow. Any suggestions?



Here's my speccy:

Operating System
MS Windows 7 Home Premium 64-bit
CPU
AMD Phenom II X4 955 44 °C
Deneb 45nm Technology
RAM
4.0GB Dual-Channel DDR3 @ 666MHz 9-9-9-24
Motherboard
ASUSTeK Computer INC. M4A79XTD EVO (AM3)
Graphics
VH226 @ 1920x1080
1024MB GeForce 9500 GT (EVGA) 46 °C
Hard Drives
732.57GB Seagate ST3750330AS ATA Device (Unknown Interface) 32 °C
Optical Drives
LITE-ON DVDRW SHW-160P6S ATA Device
Audio
VIA High Definition Audio

i wonder if it is still trying to run, go into task manager (CTRL SHIFT ESC) and check under processes>show processes for all users for something that looks like it could be the installer, if there is then end the process,

Yes it was trying to still run, so I ended it but it still acts relatively slow. I just don't understand why it just loads forever and nothing ever comes up. If I keep clicking while it's loading, the screen goes white and says that windows explorer has stopped working and this is the problem report:

Problem Event Name: AppHangB1
Application Name: explorer.exe
Application Version: 6.1.7600.16450
Application Timestamp: 4aebab8d
Hang Signature: b72e
Hang Type: 256
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 1033
Additional Hang Signature 1: b72edd94308a0766435f4c7cddbe251b
Additional Hang Signature 2: f0e0
Additional Hang Signature 3: f0e0af9be296f7950b93469649b88662
Additional Hang Signature 4: b72e
Additional Hang Signature 5: b72edd94308a0766435f4c7cddbe251b
Additional Hang Signature 6: f0e0
Additional Hang Signature 7: f0e0af9be296f7950b93469649b88662

Well I figured it out..

I turned off Microsoft Security Essentials and then it worked instantly..

.. where did you DL it from?