I have no idea why you think that it is the RAM (Memory). However you can download a Hardware Mionatenc eMnau;l from www.lenovo.com) and run therortugfh the diagnostics.
BTW if you are running Windows XP, 256 is FAR too little memory and can cause the problems that you describe. The solution is to add 256 MBytes more memory (RAM) to take it up to 512Mbytes.
t, July 2008