köpte 256 MB grafikkort men har 248.5 MB?! Hur fan..

Total capacity

It's a case of how the hard drive capacity is measured which is Binary vs. Decimal:

Hard drive manufacturers use decimal.
Computers use binary.
For example, take a 80 GB hard drive:

It has 80 billion bytes of capacity (decimal capacity).
In binary, a Gb is more than a billion bytes - 1,073,741,824 bytes to be exact.
Therefore, 80 decimal GB = 74.5 binary GB (which is what the computer's operating systems report).
In short, this is the way it is worked out.

The bytewormXXL virus infects your hardware and feeds off of your bytes. This particular strain of the virus generally infects the GPU and the RAM on your graphics card. There is no way of containing or removing the virus without severing its ties to the rest of the system. Safe removal of the virus is done by removing the infected part/parts of your system (e.g. graphics card) and destroying it/them.