Monodevelop crashing

I’m new to unity, and I really want to learn it…
I attempted installing the Unity, but it always says NSIS Error. I bypassed the checking, and installed it, but Monodevelop doesn’t work(Also gives some error while installing). It installs, but crashes when I open it to edit a script.
I also downloaded and installed it from monodevelop.com but the same thing happens.

I’m on Win7 64bit. Do I need some other software for it to work?

Create DEP Exception:

As Microsoft says,

Open System by clicking the Start button Picture of the Start button, clicking Control Panel, clicking System and Maintenance, and then clicking System.

Click Advanced System Settings. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

Under Performance, click Settings.

Click the Data Execution Prevention tab

    Select the check box next to the program that you want to turn off DEP for, and then click OK.

    If the program is not in the list, click Add. Browse to the Program Files folder, find the executable file for the program (unity3d) (it will have an .exe file extension), and then click Open.

Hope this might work for you…

NSIS ERROR

The NSIS errors may occur under one of the following conditions:
1. Software files downloaded from the Internet are not complete.
2. Downloaded software files have been modified from the original version.
3. Your PC is infected with a virus.
4. Physical media being used to install the program is damaged.
5. Required hardware (For example, CD/DVD drive) is malfunctioning.

You may do the following tasks:
Note: Try to install your software after each task.

  1. Delete the cache of your Web browser. To do this, in the Microsoft Internet Explorer 8 window, open Tools menu and then select Delete Browsing History….Next, click the Delete All button and also select the check box in the confirmation box that is displayed. Finally, click Yes to completely clear the browser cache.
  2. If the name of the downloaded installer files comprises multiple words, rename it to have only one word, say, SoftwareNameInstaller.exe.
  3. If available, download the software installer file from another approved source.
  4. Update your antivirus/Security software program.
  5. Disable your antivirus program and any download accelerator tool on your computer, before performing the download.
  6. Thoroughly scan your PC for possible virus or spyware infections.

Follow the link below to run the free online scan:
http://onecare.live.com/site/en-us/default.htm
The following thread discusses about removing viruses and malware online:
http://social.answers.microsoft.com/Forums/en-US/vistasecurity/thread/ba80504b-61f1-4d71-960f-b561798b7b42

Another workaround:

  1. Open Command Prompt window, to do so, click start windows and in the search bar type cmd.exe and right click on it and run it as administrator.
  2. Drag your installer file into this window.
  3. Press the space key once and type /NCRC and then press Enter.

Hope it helps @Manco Capac.

Still does not work…