Are these worth trying? Would it really help a pc with 192 mb RAM?
Boost up your computer memory
RAM Boost Master is a RAM memory optimizer. It optimizes your cache to act as a ram booster, boosts up your computer speed, frees up RAM memory and makes your computer faster and stable.
Personally, I’d just go with a lighter OS. Have you looked at a lite version of XP? Or Windows For Legacy PCs (WinFLP)?
Windows tends to have a lot of services and other stuff running that use up RAM. If you just want a computer for e-mail, browsing, word processing, etc., then you’re better off doing a clean install with a light OS.
Ok…thanks for the info Mig. 
Due your duty to the economy. Junk it and buy a new computer.
Ubuntu, I hated it at first, but now a few months and have figured it out. Easy to run, very light.