It's all about the x32 and x64 bit versions.

It looks like you will have a x32 system.

Go to 'Start/computer', right click ad computer and you will get the info you need.

Start your browser and search for:

how can I see if I have a x32 or a x64 bit pc have?

https://www.google.nl/search?q=how+can+I+see+if+I+...

http://www.bing.com/search?q=how+can+I+see+if+I+ha...

The answer too your question will be a x64 bit version incase you do a lot of havy grafics and that kind of stuff. Like games, pictures, movies and so on. In some cases a lot faster than the x32 version.

For this version you need a x64 bit processor and mainboard.

https://www.google.nl/search?q=pentium+4+x64+mainb...

http://www.google.nl/url?sa=t&rct=j&q=&esrc=s&frm=...

http://en.wikipedia.org/wiki/Pentium_4

Hopefully I let you know enough and that you will find the answer you seek!

Check the link belowand go from there.

Either way you'll have to increase your memory to atleast 4 gbs

http://windows.microsoft.com/en-US/windows7/produc...