I would try cleaning the memory stick first as suggested, however, if your PC is only two months old I would not expect to see much corrosion on the contacts.
When I first built my computer I had memory issues that seemed to be "cured" by reseating, but they kept coming back. After a few random incidents, I bit the bullet and ran Memtest86+ -- yup, the memory module was bad.
I suggest you go to http://www.memtest.org/
and download either the precompiled ISO in zip format (this makes a bootable CD) or the precompiled package for floppy (to make a boot floppy). Both downloads have readme files with instructions on making the boot disk. The webpage has loads of information on using the program. But please, do the download and make the disk on a healthy computer, not one whose memory is suspect.
The good news is that most memory comes with a warranty, and will be replaced at no charge other than shipping (if applicable).