Rotating a vector around another vector

I have tried all possible examples found on the web, but I can't get this to work.
I need to rotate a vector3 around another vector3 in 3D space.

The vector to rotate around is always [0, 0, 0].

Basically, I have a second point in 3D space, and it has to rotate in all axis (x,y,z).

Examples of what I think that has to be done:
(rotation should be in radians, not in degrees)
Point = [0, 12, 0]
Rotation = [0, 0, 90]
Return [0, 0, 12]

Point = [12, 0, 0]
Rotation = [90, 0, 0]
Return [0, 0, -12]

Point = [0, 0, -12]
Rotation = [0, 90, 0]
Return [0, -12, 0]

Anyone has any idea? Because when I use:

Code:

---

                Public Function GetNewPos(ByRef Bone As Bone) As Vector3
                    Dim radius As Single = GetDistance(New Vector3(0, 0, 0), Me.RLocation)
                    GetNewPos = Me.RLocation

                    Dim crotz As Single = GetPointRotation(New Drawing.Point(GetNewPos.X, GetNewPos.Y))
                    crotz += Bone.Rotation.Z
                    GetNewPos.X += Math.Cos(crotz) * radius - GetNewPos.X
                    GetNewPos.Y += Math.Sin(crotz) * radius - GetNewPos.Y

                    Dim crotx As Single = GetPointRotation(New Drawing.Point(GetNewPos.X, GetNewPos.Z))
                    crotx += Bone.Rotation.X
                    GetNewPos.X += Math.Cos(crotx) * radius - GetNewPos.X
                    GetNewPos.Z += Math.Sin(crotx) * radius - GetNewPos.Z

                    Dim croty As Single = GetPointRotation(New Drawing.Point(GetNewPos.Y, GetNewPos.Z))
                    croty += Bone.Rotation.Y
                    GetNewPos.X += Math.Cos(crotx) * radius - GetNewPos.X
                    GetNewPos.Z += Math.Sin(crotx) * radius - GetNewPos.Z

                    'GetNewPos.X += Math.Cos(crotz) * radius
                    'GetNewPos.Y += Math.Sin(crotz) * radius
                    'GetNewPos.Z += Me.RLocation.Z

                    'GetNewPos.Y += Math.Cos(croty) * radius
                    'GetNewPos.Z += Math.Sin(croty) * radius
                    'GetNewPos.X += Me.RLocation.X

                    'GetNewPos.X += Math.Cos(crotx) * radius
                    'GetNewPos.Z += Math.Sin(crotx) * radius
                    'GetNewPos.Y += Me.RLocation.Y

                    Return Vector3.Add(GetNewPos, Bone.Position)
                End Function
            End Structure

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It is used to rotate a cube by changing the points (it is for a basic bone system) One direction works, but when I use combined rotations it fails. (stretches in the weirdest positions).
The commented-out code is the code that works when used alone (only one of the 3 sections for only one rotation)

The GetPointRotation function returns the rotation in radians relative to [0,0,0]:

Code:

---

    Public Shared Function GetPointRotation(ByVal Point As Point) As Single
        Dim width As Integer = Math.Abs(0 - Point.X)
        Dim height As Integer = Math.Abs(0 - Point.Y)
        Dim r As Double = Math.Sqrt(width ^ 2 + height ^ 2)
        If r = 0 Then
            Return 0
        Else
            If Point.X >= 0 And Point.Y >= 0 Then
                Return Math.Atan(height / width)
            ElseIf Point.X <= 0 And Point.Y >= 0 Then
                Return Math.Atan(width / height) + 0.5 * Math.PI
            ElseIf Point.X <= 0 And Point.Y <= 0 Then
                Return Math.Atan(height / width) + Math.PI
            ElseIf Point.X >= 0 And Point.Y <= 0 Then
                Return Math.Atan(width / height) + 1.5 * Math.PI
            End If
            Return 0
        End If
    End Function

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