HP Pavilion p7-1108p Desktop

Windows 7
6GB RAM
1 TB HDD
AMD processor

Before I buy expensive new RAM to bring this system's max up to 16GB, I want to download and install a relatively easy-to-use memory tester so I know my current 6GB is still good...sluggishness when 2-3 programs are running has me concerned.

The subject product is apparently highly regarded (per a Crucial rep) and downloaded very frequently from the website of the same name.

Suggestions? I have to take a deep breath when I start reading about creating a disc image to burn, I'll be honest, but I'm great at following a mfr's step process as long as it's clear and well written : )

Thanks in advance.

sbuxman