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Too many choices!
Questions often arise when it comes to which processor to use. Although many processors are clearly better than others, some are better at some tasks than others. Some simple trade offs can make serious differences in the way your system performs. Having a computer system built specifically for your needs doesn't necessarily cost more. Many processors are much the same in cost and work slightly better for different uses. Ask your local tech which is best for you.
To thread or not to thread
By disabling hyper threading, generally you get less power consumption and less heat generated... and you may actually be able to get more performance out of your system by disabling hyper threading, as long as you're using programs that don't use it. You should be able to overclock higher without HT as well. Currently, faster clock speeds and larger cache tend to work better for gaming. When it comes to video / compression etc, more and more appz are using the technology. For a closer look.. check out the specs and reviews on the 2600k, and the 875k
In short,
Hyper threading OFF for gaming and daily use.
Hyper threading ON for video encoding /compression task/ folding/

Recover lost files...
If you've accidentally deleted a file, right-click the folder where it was stored, and click Properties-Previous Versions. If you're in luck you'll see earlier versions of the folder, each dated with some point in the last few days. Double-click one from a time when you knew the file was last still around, it opens in Explorer. If the file is still present you can open it as normal.

Why computers slow down...
A new computer right out of the box is an engineering marvel. Programs and files load with lightening speed. Unfortunately, computers do not remain in this pristine condition for very long. You do not notice it at first, but usually sooner rather than later that peppy performance is gone.
There is no single answer; a combination of factors contribute to the gradual degradation of a computer’s performance. The causes fall into several categories.

• The first is hardware design, software implementation and configuration.
  
• Another is virus and spyware infiltration, and often the antivirus product itself
  

A great deal of performance degradation is caused by some of the remedies the user may have applied to cure the above causes!

 Other contributors are just simple use of the computer.

•  Surfing the net
•  Downloading files
•  installing and uninstalling programs
•  Creating documents 

Windows creates temporary files to do what is needed at the time and in most cases, these files are left behind. As your computer is running it has many more files to search through to find what it’s looking for; this takes more time, slowing down your PC. Uninstallers rarely remove programs fully that are no longer in use. Often temporary files, registry entries, and folders are left behind.

 
The Heat is On
Chips, inside your computer, especially the CPU, create heat. As electrons race through all of those miniature circuits, they encounter subatomic resistance. That resistance, and the heat it produces, really adds up when you multiply it by all of the electrons bumping around in there. A constant flow of air over your system’s various components keeps them at an operational temperature to prevent overheating yet manage the heat build up.

Heat kills, which means you need to keep track of this variable. Concern about heat in personal computers is a relatively new phenomenon. In the old days, computers didn’t perform enough work to generate enough heat to worry about. Simple passive air flow over the CPU dissipated any heat it produced. Today’s much more powerful, faster processors generate tiny but impressive PC saunas that require the constant cooling of internal fans.