Posting make and model would help a lot, but not everybody has a system that is easy to get the model number from.
The 'corporate' machine (eg dell, compaq, HP, etc) can have several different system with the same basic name. In those cases, just listing (for example) "Acer Aspire X3810" wont help, we would need the full model number, Acer Aspire X3810-EQ8200A.
'White box' machines tend to not have any model numbers, to see what is in the machine takes a screwdriver and eyeball (my perfered method), or you can use one of several different hardware reporting tools for windows. Links to some of the hardware dectection programs are list in this page (under 'Third-party programs')-