I need some serious help about mega bytes?

Don't make life so difficult.

Bytes are units of measurement in capacity.

A hard drive might be capable of storing so and so megabytes of data.

Memory can be so and so bytes in capacity (storage capability).

A program (like Windows Live) may take up so and so bytes of hard disc space.

Here's a run-down:

8 bits (the smallest unit is bit) = 1 byte.

1 Kilobyte = 1024 bytes (1000 rounded off for convenience).

1000 Kilobytes = 1 Megabyte

1000 Megabytes = 1 Gigabyte

1000 Gigabytes = 1 Terabyte

etc.

You may be in Control Panel, where you can uninstall programs, so if you uninstalled Windows Live, you would gain 2.78 Megabytes (MB) on your HDD (Hard Disk Drive).

If you installed a game that's 5 Gigabytes in capacity, you would take up 5 Gigabytes of hard disk capacity. So if you have an HDD of 100 GB left on it and you installed a game that's 5 Gig. You would be left with 95 Gig on the HDD.

Memory is also measured in Megabytes or Gigabytes.

If you have a PC with 2 Gigs of RAM (Random Access Memory) and you run programs requiring more than that in total, without exiting any programs, the PC OS (Operating System) will complain or go nuts on ya and maybe even give ya a BSOD. (Bloody Swift kick On your Dimples).

(Blue Screen Of Death).

Use Windows Help feature or buy a magazine to explain life's major problems for you.

;-)

bytes is a measurement system, very similar to meters. (millimeter, centimeter, kilometer, etc), liters, and other SI units. A byte the base unit for computer data mesurement, It is made up of 8 bits, and a bit can is a variable or computed quantity that can have only two possible values, 0 or 1 (false or true). But to answer your questions, and one Megabyte is 1,048,576 Bytes, or 8,388,608 Bits. Here is the breakdown for the Byte System can be found http://www.t1shopper.com/tools/calculate/ . Just scroll Down until you reach the tables with the info in it. Hoped this helped.

"windows live sync; installed 8-10-2010; 2.78MB."

That's the amount of disk space being used by Windows Live Sync

In Windows 7 at the top of the column, that the number is in, will be the heading "Size"

1024 Kilobytes is one Megabyte, 1mb. the only thing you should be worried about megabytes is in your Hard drive, Drive C:, it'll tell you how many Gigabytes, (1024 MB = 1GB) you have left, so if you are running low on Drive C:, delete some things, other than that, dont worry about windows live's mb. its probably just the size of the program. for your example, it shows 2.78mb, its the size of the program, im too high to figure this out...

No, it does not mean the amount of memory but it can be used to describe such. It is a unit, like a metre. It can be used to describe the capacity of digital devices, such as hard disk drives, optical disks, USB drives and Random Access Memory.

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

that amount that is in there. I get your questions and that amount of memory is before whatever your using is formatted. Like my ipod says 8 gigs..... but the formatted amount is 7.12 gigs of accessible memory. so it uses a little less than 10% so you have like 2.25 - 2.5 MB that you can actually use i hope this helped

Neither...and both. It is a measurement of data size.

The usage depends on the context.

I don't have Windows Live so have no idea what that is referring to. Unless you provide a context. Someone else might be able to tell you.

---Edit---

If windows live stores messages, it might be the total size of your messages. But thats a guess.

It would help if you explained WHERE you see this, and what is written next to it (if anything)

in the way you are saying it or what i see you saying it like is that the 2.78mb is what size the file is which in this case is windows live aka the size of what it will take up on a disk