I hope no-one minds me jumping in. I'll just try to clarify some things here.
I'll quote a few things and put my opinion in.
download PC Accelerator 2007 , install it configure it after configure u have to press the button it says " Apply Settings " its on the top of ur program and then it will ask u to restart ur system, just do it .
I'm not sure what this program does, but it looks like a program that does overclocking. I wouldn't recommend a program like this on a PC unless you know what you are doing with it. The user doesn't want to overclock, the user wants to get rid of the slowness of the PC.
read that and disable all ur unnecesary services on windows xp , make sure u dont need it and make sure to read that website as good as possible
Again, unless you know exactly which ones to turn off I would not recommend turning off any services at all.
and finally go to : Start/Run/type " msconfig " press enter/BOOT.IN/select " /SOS " its on the bottom/then go to startup its right there at the top
As 123Runner already pointed out. /SOS will not do anything beneficial for the user at all. I recommend keeping this setting off
Ccleaner (in my signature) is good very a lot of cleaning up.
Do not use any other registry cleaners. They generally do not work.
I tend not to recommend CCleaner. Instead I recommend ATF-Cleaner. CCleaner has a registry cleaner built-in and I find it an unsafe cleaning program. It gets rid of shortcuts I'd rather keep. ATF-Cleaner can be found HERE.
Another note. Registry Cleaners to -nothing-
good for your computer. In fact they only make it worse.
triedeverything, If you could answer the questions below we might be able to work out what is causing all this.
(As jt1990 said) How much RAM do you have in your PC?
How fast is your CPU?
How old is your computer?
What do you use your computer for?
I hope I will be able to assist.