You are welcome.
If you only have 1 DIMM, then I wouldn't buy any more RAM. (You may want start budgeting for a replacement computer, though.)
I'm guessing your system is at least 4 years old, running 100MHz or 133MHz RAM. I'm also guessing you have 2 or four DIMMs. If I'm guessing correctly, there's really no reason to remove the stick you have as long as your computer can see 1 GB or 2GBs of RAM, just add another stick.