Speccy
This is a very useful little program that will tell what exactly is on your computer − it's a very small piece of software and takes up very few resources. You can download Speccy from the official website at:
Free Version: http://www.piriform.com/speccy/download (no support)
Business Edition: Purchase Speccy / 1 Year Maintenance (Single Workstation) Here (full support)
Love this little wonder−program. When run it provides a detailed breakdown of the following:
Operating System CPU
RAM
Motherboard
Graphics
Hard Drives
Optical Drives
Audio
Click Here / Get Speccy Professional
So for example if you want to check out how much RAM is installed on your PC and whether or not you have the option to add to it. This is probably the best 'fix' you can customize your PC with. It makes a HUGE difference to computer speed in general. Further details on this coming up next.