That board is getting a little long in the tooth. It uses a G series southbridge chip.
It states at their website that it can support 4 gigs but if you're running a 32 bit OS it will most likely show 3 gigs or less. The recommended total is 3 gigs.
DDR2 ram is on it's way out and if you don't shop carefully, can cost more than DDR3. The best way to make use of that platform is to keep it tidied up on a regular basis. I don't mean tear the case open every week and brush n blow the inside out but instead keep the riffraff and unused garbage cleaned out of the soft side of the system.
I cleaned my system out just today and she's pretty happy. Running like a well balanced prop on a quad. Smooth and quiet.
Make use of the toolbox found here > PC Cleanup Toolbox
When you run combofix if you have any realtime malware and antivirus programs running it will advise you to shut them off. Disable your internet connection so you don't appear naked to some hacker wanna be pinging for unprotected computers. When you finish with combofix re-enable your security and reconnect to your ISP. When you run a few of the other goodies in the box you'll have to update the data files so they have up to date data to work with.
All in all it should take a good hour or so to run all of the items in the tool box.
Now for you rookies(because I personally hate the term noob) stay clear of Black Viper. You bugger that up and you'll most likely lock your self out of your system. In some cases so bad you'll have to wipe the drive and reinstall the operating system.
Not to worry though. The rest of the tool box is very safe. A lot of us here use these goodies to keep our computers purring along.