Well...we would need to know;
what OS you are running.
How much RAM do you have in the comp.
Is some of the RAM shared with the video etc (in other words do you have onboard video etc)
By you saying you have services running etc...sound slike you have XP (or maybe W2000)
If its XP you should know that you have a lot of junk running that you dont need..all those services etc.
Look here
www.blackviper.com and find the page about "xp services" and he has a diagram or two showing which services you can safely disable.
I think this might be the link
http://www.blackviper.com/WinXP/service411.htm
You run "services.msc" and then you simply highlight the service and click "properties" then you set it to "disable" to cut it off.
Some of it is obvious..likeif you dont have a wireless network, you dont need "wireless zero configuration" running.
There are many you dont need but I cant remember many off the top of my head.
Some unneeded ones are
Portable Media serial number
Error Reporting
Windows Messenger (not related to msn messenger)
Secondary logon
Smart Card
Smart card helper
on and on
Most of them are "junk" and they just use up your resources for no reason.
JP