first of all you should make the pi use the same language as windows
Every language the Pi uses is also available on Windows...C, C++, python, scratch, an assembly language, FORTRAN, BASIC, and so on and so forth. The *difference* is that the language processors for the Pi are all free, but some of them--in some versions--on Windows will cost money.
I bought it and downloaded debian pi os, really hard to use and understand (did 3 hrs of googling and found nothing) make it support vga because i had to buy a screen that supported dvi which cost me a LOT of money.
The Pi would cost a lot more if it had to include VGA output. There are cheap (<$20) HDMI-to-VGA adapters. Some people find they work well, other people have trouble with them. The next step up is in the $30 to $50 range. In either case, that's a lot less than buying a monitor, unless you've got a reliable source of cheap, used monitors...in which case, it's a wash, most likely.
Provide all the equipment when you buy it (obviously raising the price) e.g.: keyboard, mouse, etc because i had a really hard time with that.
Some companies provide a "bundle" that includes everything you're asking for (except the monitor and any video conversion device). If you don't have the accessory items on hand (many of us have this stuff lying around the house as spares or backups), and you don't have any particular sources that you deal with to get minor items, then a bundle is generally a good deal. In any case, the web sites for the companies selling the Pi are quite plain in stating that it is a "bare board, ONLY" and that all the rest of the stuff is up to you.
Indeed...several of the sites have a drawing of a Pi and accessories so that you can click on the various "parts" to see what that vendor sells for that particular use.
Improve RAM and CPU power because it's really slow
"Slow" is relative. I have a major application for which the very oldest versions work just fine. At present, the setup utility (raspi-config) has safe overclocking setting made easy (there's part of the answer to your speed issue) and the latest versions of the Pi have more memory...512MB. (FYI...that is the same amount of memory that my--it still runs--Win98SE system has).
The other speed issue is one of software. *If* you are using the graphical desktop (GUI), *then* the work to get hardware acceleration for X should help quite a bit.
The point is...the Pi is still a "work in progress". It just happens to have fired the imaginations of a great many enthusiasts and has grown into a far larger "ecosystem" than was otherwise expected at this time in it's development. Not many hardware projects from new "companies" sell 500K units at the "developer" stage of launch. The Pi has had that happen.
Also make it support windows because there's no such thing as 'Norton antivirus for Debian pi'
Windows will NEVER run on this level and type of hardware as a primary operating system. I did read about one person that actually got Win95 to boot under DosBOX, but that was little more than a "Look what I did!" effort. You *might* be able to get something like Win3.1 to actually run an application on a heavily overclocked Pi...but would it be worth the effort?
As for the A/V issue. The viruses that are most likely to be a problem won't run on Linux (the system calls are all "wrong"), nor an ARM (and especially, ARMv6) processor. Between the hardware and software challenges and the restricted numbers (I saw a recent article that PC makers expect to sell "only" about 350 MILLION PCs this year....vs. less than a million Pis), the Pi simply isn't likely to be targeted by virus writers. If it comes to that, while something like Norton won't run on a Pi, there *are* (so far as I know) A/V programs for Linux, and those could--or could be made to--run on a Pi...if you wanted to make the effort.
One other point on Windows...Linux can be gotten for free. Windows will cost you roughly $100, at a minimum. AND, don't even think about Win8, because that won't run on a Pi either (no UEFI and wrong ARM instruction set).
Provide a switch or safety system to make it safe, and make it come with a case, I got electroshocked already more than 6 times
Neat trick, that. How did you manage it?
Make it support wifi and not wired connection
It does. What you need is called a "wifi dongle". Prices start at less than $8. If you don't want to have it occupy one of the only two USB ports, you can add a USB hub (that will give you more USB ports) or a wireless access point/bridge and make the Ethernet connection the Pi has wireless. I have also seen various listing for a device that is a wireless adapter using the Ethernet connector. Prices run from about $15 to around $30, depending on who you get it from. The default way to power it is...through a USB port. It uses *both* the Ethernet connector *and* a USB port! In fairness, the pictures show it using an adapter for the USB connection, so it should be possible to find an independent power block for this device. *That* would give the best of both worlds.
I do have to object to the "not wired" part of your remark. I run my networks wired. That gives them better security and reliability plus better speed. I do understand that a lot of people like and use wireless LANs, but the one should not be done at the expense of the other. In the case of the Pi, keeping the price low is a major goal...and adding wifi would blow the budget.
Really...the question that has to be asked is: What did you think you were buying when you bought a Pi?