Aspire 7750G switchable graphics are unreliable

Acer Aspire 7750G-6645

Intel Core i5-2450M

2.5Ghz w turbo up to 3.1

AMD Radeon HD 7670M 1GB VRAM

8GB DDR3 RAM

I had the exact same problem. It took me a really long time to get my computer to recognize my integrated card. I had almost given up, this might not work for you but it worked for me and i will share what i did to fix my problem. You dont have to do a fresh restart of windows but i had messed with alot of my settings when i was on my trail and error troubleshooting stage, so i decided that it would be better to a fresh restart. After my computer was up and running from the windows reboot, the first thing i did was update my video drivers for my native card which is the Intel(R) HD graphics 3000. To do this i clicked on the bottom right upward arrow that is located on the taskbar next to the battery charge icon. Next, i went to options and support tab tab located on the left side clicked on help and support then followed the link to http://www.intel.com/p/en_US/support/detect?iid=dc_iduu (i used the autodetect option and  installed the drivers.

My next step was to update my acer drivers. I went to http://us.acer.com/ac/en/US/content/drivers, to look for my specific laptop drivers i actually used the "search by serial number or SNID" option and it went straight to the drivers i needed. A list of 18 drivers came up for me but i chose to only download two drivers which were the chipset driver (from intel because that is the chipset that corresponds to mine) after doing that i downloaded the Video Graphics Adapter (VGA from AMD because that corresponded to my radeon graphics card.) 

As i mentioned i went through alot of trails and errors before figuring out what worked for me. Some of my errors were trying to switch my BIOS from switchable to integrated to see if the card would detect for some reason but it never worked so i defaulted it back to switcheable. Another one of my mistakes was to download the drivers straight from AMD/ATI websites. When i downloaded the Control Catalyst Center (CCC) from the AMD site the CCC tried to download the newest drivers but i kept getting a message saying, "AMD catalyst mobility cannot be downloaded due to incompatible hardware/software on your computer. the version of your graphics adapter is not supported. Please contact your notebook manufacturer for a graphics driver update" this is what made me uninstall the catalyst from AMD/ATI site and to just use the ones from the ACER site(even though they were not the newest).

Hopefully this helps anyone having this same problem. I had almost given up on the idea that my switcheble graphics card would ever work and i was planning to buy a newer laptop, but due to the fact that i hate spending extra money when i have a perfectly good laptop at my fingertips already i decided to try everything possible to fix my problem.