It can help with some issues.

 

You can define the 'as administrator' by right click on the file/on the icon, choosing properties, compatibility, change ... for all users ...

The excellent guide posted in Post #2 by Oliver (olli4740), has all the guidance you need to install FSX.  The key is, what version(s) of FSX do you have?  Do you have FSX Deluxe?  Do you have Acceleration?  If you have Acceleration, you first install FSX, run it once to get an FSX.cfg generated and make sure it is running properly.  Do not install any SP's or addons.  Just run FSX and set it up the way you want it initially.  Once completed, you can install Acceleration.  Acceleration contains SP1 so you do not need to install that.  SP2 is the same as Acceleration except SP2 is freeware and does not include all the extra aircraft, sceneries, and missions.  You do not want to install SP2 and then Acceleration; otherwise you will definitely have problems.

 

Once Acceleration is installed, run it and configure the FSX settings in the manner you want it.  There are lots of guides on tweaking or changing some of the settings to make FSX work better.  One is the AVSIM Software and Hardware guide pinned at the top of this forum.  Another excellent guide entitled Setting Up FSX and Tuning It can be found at the following link - http://www.simforums.com/forums/topic29041.html. 

 

Lastly, if you do not want to install Acceleration, you would first install FSX, run it at least once, then SP1 and run it at least once, and then SP2.

 

After FSX is up and running successfully, you can slowly begin to install your freeware or commercial addons.  Commercial addons pretty much install everything and you don't have to do anything else except Go Fly!.  Some will make you go into the Scenery Library and add the scenery manually.  That's another long story if and when you want to do that.

 

Hope this helps.

 

Best regards,

Jim