You are using Windows 95or 98, which is not for professional programming. You should set up Windows NT server, workstation, or Windows 2000 professional.
Tomcat is lightweight, so you can run it on Win 95/98. However, you need to expand
"virtual memory". Here is how to do it:
1) Find C:\config.sys, add a line
shell=c:\command.com /e:16384 /p
Then, restart the machine.
2) Another way to do thigs is to open
MS-DOS, and isuue a command
command.com /e:16384 /p
Then, do to c:\jakarta-tomcat\bin and run startup.bat.