How i fixed my problem of rundll32.exe?

How i fixed my problem of rundll32.exe?
I searched in many forum sites of how to repair rundll32.exe but turns out many sites led me to specialised PC repair products which would perform free scans of my computer and when it comes time to fix them, they ask for product keys.
I certainly believe they would never repair the rundll32 file as they never actually detected them.

So i decided to replace the rundll32 file with the backup file. For those of you who dont know where the rundll32 backup file is located, its in your C:\Windows\Prefetch or your i386 folder. When i went to delete the rundll32 file it said ’Access Denied’ which turned out to be another dead end.
I finally gave up and decided to format my whole PC. When i was almost thinking to go for it, i came across an article which i thought was worth a last try. You can find this article over here.
According to the article, i took the following steps:

1. First, to take ownership of the rundll32.exe file go to Start menu > Run. Type cmd to open Command Prompt.
2. Now type the following command to take ownership of the file :
   takeown /f  C:\Windows\System32\rundll32.exe
3. Dont hurry, we still cant delete the file, we have just taken ownership of the file and have no control over the file yet. Now type the following command to gain full access on the file :
   cacls C:\Windows\System32\rundll32.exe /G rdx:F (NOTE: Please replace ‘rdx’ with your System Username)
4. Thats it, now head over to C:\Windows\System32 and delete the rundll file. If you still cant delete, restart your computer in Safe Mode and open CMD. Then type in del C:\Windows\system32\rundll32.exe.
   This will surely erase the file from your system.

Now i sucessfully copied the backup file into C:\Windows\System32 folder. Your backup file will be located in either C:\Windows\Prefetch folder or the ‘i386′ folder.
Finally, my WINDOWS was working fine.

Download a genuine copy of rundll32.exe for Windows 7 operating system over here.

Please leave a comment if this tutorial has helped you in any way and also if you encounter any problem and need assisstance. I had be happy to help you.