I bought a 1gb stick from walmart. When I installed it the computer would not recognise it. I tried every configuration I could think of but all the computer would see is the original 512mb. I figured that maybe I had a bad stick so I tried to return it and after a long unpleasant discussion with the electronics dept. employee my money was refunded,but not before being told by everyone in that dept. that my machine was not upgradable.

I left angry,but at least I had my money. I then went to best buy and once again was told that the 2gb kit that I decided to purchase would not work. They told me that I needed to buy two 1 gb sticks seperate which made absolutely no sense to me. I was informed that I should try to keep the sticks in pairs if possible. They insisted it would not work that way.
I left the store pretty much furious.

So now I come to you guys. I hope you can help me out. I would like to have 2gb RAM in my machine,but will settle for 1.5gb it's no biggy to me. The computer works ok with what I have,but I just want a little more pep.
I'm not a gamer or anything like that.
The computer specs are as follows..I know she's no hot rod...hehe.
CPU : AMD Sempron™ 3100+ Processor
(256KB L2 cache, 1.8GHz, 1600MHz system bus)
Operating System : Genuine Microsoft® Windows® XP Home SP2
Chipset : NVIDIA® Crush 51
Memory : 512MB DDR (1 × 512MB) 400MHz (PC3200)
Expandable to 2GB
Hard Drive : 100GB (7200rpm, 2MB cache)
Optical Drive : 16x multiformat dual-layer DVD±RW drive (up to 8.5GB with dual-layer media)
Media Reader : 8-in-1 digital media manager (Secure Digital™ (SD), Smart Media, Micro Drive, Memory Stick®, Memory Stick Pro®, Compact Flash, Multimedia Card, USB 2.0)
Video : NVIDIA® GeForce®™ 6100 GPU
Up to 128MB of shared video memory
PCI-Express® (PCI-E x16) slot available
Sound : 6-channel (5.1) AC'97 audio
Network : 10/100Mbps Ethernet LAN
Modem : 56K ITU v.92-ready fax/modem
Peripherals : Standard multifunction keyboard, 2-button wheel mouse, amplified stereo speakers
Ports/Other : 5 USB 2.0 ports (1 in media manager, 4 in back), VGA external connector, serial port, parallel port, 2 PS/2 ports (keyboard and mouse), 5 audio ports (2 in front, 3 in back)
Dimensions : 14.25"H x 7.25"W x 16"D
Weight : 22.5 lbs