Or it may run under Windows 95, but only a certain, specific version of Windows 95. But your CAT software may steadfastly refuse to cooperate - or at least reluctantly drag its feet. Random-access memory is a prime factor to consider. With plenty of RAM available, your computer will be able to juggle chainsaws while standing blindfolded on one foot. Too little RAM, and you'll be lucky if it can walk and chew gum at the same time.
Some people confuse RAM with hard-drive size.
Using a kitchen analogy, a hard drive is like a pantry, whereas RAM is your counter space. Here again, your CAT vendor can advise you. This is a key area where a little foresight can extend the useful life of your notebook. If your CAT vendor recommends 32 megabytes of RAM as a minimum requirement, consider increasing it to 64 megabytes or more. If you really flog your system by running spreadsheets or heavy graphics programs, like desktop publishing suites, goose it up to 96 megabytes.