Q: i keep getting "OS X Mavericks requires at least 2 GB of memory."

Check this Apple article:

http://support.apple.com/kb/ht5842

and look at a reliable supplier 

http://www.crucial.com/uk/  

then to install it 

http://support.apple.com/kb/HT1423?viewlocale=en_US 

or

http://www.youtube.com/watch?v=HCFSZnTRggU etc...

Purchase and install more RAM.

FYI, OS X Mavericks really needs a "working" RAM minimum of 4 GBs of RAM.

If your Mac can take more RAM than this and you can install more than 4 GBs of RAM, do it!

Correct and reliable Mac RAM can be purchased from online Mac RAM sources Crucial memory or OWC (macsales.com).

Good Luck!

What is the model of your Mac?  You can get it via the System Information app (in the Applications/Utilities folder).

OT