Welcome MrsPrincess, sorry to hear you're having troubles.
Let's get this sorted out :)
It does appear your CPU might be a bit underpowered, but let's still see what we can do...
Which graphics card are you using?
Hopefully it's either an nvidia or AMD card.
If Nvidia, go to this site and update your drivers:
http://www.nvidia.com/Download/index.aspx or it's AMD, go to this site and update your drivers:
http://support.amd.com/en-us/downloadPlease let us know how you make out and which graphics card you're using.
Thanks