Conventional memory problem

I keep getting a “Not enough conventional memory” error even though I have put in the following lines in the config.sys device=c:\windows\himem.sys
device=c:\windows\emm386.exe noems
dos=high,umb
Also, since this error message appeared, ALL Office products (word, excell, etc.) open for about 4 seconds and then close. The PC is virus free. HELP