Help me in troubleshooting my PC

I am using an assembled PC which is very slow; Help me to speed up my PC
Please.
Configuration:
Ram: 1GB
Processor: Intel Pentium
HDD: 500 GB
OS: Window 7 basic
How to speed it up it takes too much time in booting, starting any program, Even in deleting files from recycle bin, VLC player takes 4-5 minutes in starting.
Please suggest me the possible solution. I tried many Softwares, but none of them helped me.
