Hello Sir, My PC configuration is :
Windows - XP Service Pack 3
Motherboard Model - P5P800-VM
Bios Version - AMI 3000601
Processor - Intel Pentium D CPU 2.80 GHz
RAM - 1.99 GB
Hard Disk Space - 160 GB
Inbuild Graphic Card - 64 MB.
My computer is being slow in most of things, If I open games, it becomes more slower, but when I do nothing it gets fast. I tried most of things in softwares, I formatted my whole PC with NTFS system 3 times with 3 kinds of Windows. But it's no worth.
With the same configuration it was very fast before, but since one day, my PC was being slower too much, I formatted, it got faster, but not much, and it is being slow.
I am Sure that this is a hardware problem, Please suggest me some advices which would be helpful for me, Thank-you.
And, sorry for doing anything incorrect in forums, I am new here.

Go to this link and the 5th post down are things you can do to help speed things up - and other information on this link is also very helpful

https://www.askmehelpdesk.com/computers-beginners/frequently-ask-questions-about-computers-233870.html

Thank you very much, Sir, I tried all these things, but not even 1% success in speed, I know, that this problem is not from Softwares, Please if you know something else, tell me, it will be appriciatable.

I like the on line site PC pitstop they do an online scan and generally do a good job.

Here is a link

PC Pitstop: Free PC Scans and Tune-up Utilities (http://www.pcpitstop.com/)

If you are using the built in video card then I would suggest adding a decent video card, make sure all of your ram is compatible, do a dskchk on your hdd. The video card takes a load of the processor.

Keep it Clean and Running Mean - Helljack6.com (http://www.helljack6.com/clean.html)