Dell when start it blink two times

When started Dell, Vista home basic, it blick few times before settle down.

It was fix last time, but due to now I have restore back to factory image, the problem come back.

Remember it is to do with Task scheduler, seach my email, and got the below..

> STEP 1: Disable the startup
> a. Click on Start button
> b. In the Run column, Type in msconfig
> c. Click on Startup tab > Referring to the Command title, look for the 
> below and untick it.
> C:\Windows\System32\igfxpers.exe
> C:\Windows\System32\ hkcmd.exe
> C:\Windows\System32\ igfxtray.exe
> d. Click on Apply > OK.
>
> STEP 2: Disable TMM (Microsoft Transient Multi-Monitor Manager)
> a. Click on Start button
> b. In the Run column, Type in taskschd.msc
> c. Double click on Task Scheduler (Local) > Double click on Task Scheduler 
> Library.
> d. Double click on Microsoft > Double click on Windows > Select 

Mobile PC.
> e. On the center panel, select on “TMM” > Right click on it and select 
> disable.> f. Restart your computer.

Step 2 actually work and enter task in the start space.