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Adding more fans would help with the cooling of your computer, but the cleaning and maintaining your computer clean is necessarily and the most important thing to combat the over heating, you can also add dust filters to.
Another note would be that you change the thermal paste of your cpu once...
You could check your hard drive by using some free tools, search for "Hirens Boot CD".
Hirens Boot CD is a boot disk utility which comes with a lot of software for diverse needs and does not require installation.
While there is nothing wrong in using a free domain mail I would not consider them if you need them for a business, you should look for a paid service instead or set up your own if you have the tools and knowledge to do it on a vps or dedicated server if you use it for business purpose (I say...
You can also buy from yourself. You mentioned that you have an account with resellerclub, it will not come cheap but would be probably best for you until you can find a cheaper company with quality services at lower price.
The only one who could use some version of windows under XP would be some a company i think.
I knew a publicity company that needed windows 98 because the program was not supported in any version of windows that was about windows 98 and they had no choice but to stick with that windows.