度々、すみません。ＰＣ自体は問題ないとのことでした。ＯＳ７でＯｆｆｉｃｅ２００７ＳＰ３です。
Version:20170217版
System.InvalidOperationException: オートフィル列がサイズ変更されるときに、この操作を実行することはできません。
場所 System.Windows.Forms.DataGridView.PerformLayoutPrivate(Boolean useRowShortcut, Boolean computeVisibleRows, Boolean invalidInAdjustFillingColumns, Boolean repositionEditingControl)
場所 System.Windows.Forms.DataGridView.SetColumnHeadersHeightInternal(Int32 columnHeadersHeight, Boolean invalidInAdjustFillingColumns)
場所 System.Windows.Forms.DataGridView.AutoResizeColumnHeadersHeight(Boolean fixedRowHeadersWidth, Boolean fixedColumnsWidth)
場所 System.Windows.Forms.DataGridView.OnColumnHeadersGlobalAutoSize()
場所 System.Windows.Forms.DataGridView.set_TopLeftHeaderCell(DataGridViewHeaderCell value)
場所 System.Windows.Forms.DataGridView.get_TopLeftHeaderCell()
場所 System.Windows.Forms.DataGridView.GetCellInternal(Int32 columnIndex, Int32 rowIndex)
場所 System.Windows.Forms.DataGridView.OnCellMouseEnter(DataGridViewCellEventArgs e)
場所 System.Windows.Forms.DataGridView.UpdateMouseEnteredCell(HitTestInfo hti, MouseEventArgs e)
場所 System.Windows.Forms.DataGridView.OnColumnWidthChanged(DataGridViewColumnEventArgs e)
場所 System.Windows.Forms.DataGridView.OnBandThicknessChanged(DataGridViewBand dataGridViewBand)
場所 System.Windows.Forms.DataGridViewBand.set_ThicknessInternal(Int32 value)
場所 System.Windows.Forms.DataGridView.AdjustFillingColumns()
場所 System.Windows.Forms.DataGridView.ComputeLayout()
場所 System.Windows.Forms.DataGridView.PerformLayoutPrivate(Boolean useRowShortcut, Boolean computeVisibleRows, Boolean invalidInAdjustFillingColumns, Boolean repositionEditingControl)
場所 System.Windows.Forms.DataGridView.OnHandleCreated(EventArgs e)
場所 System.Windows.Forms.Control.WmCreate(Message& m)
場所 System.Windows.Forms.Control.WndProc(Message& m)
場所 System.Windows.Forms.DataGridView.WndProc(Message& m)
場所 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
場所 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
場所 System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
RPPMAN, Version=2.99.6257.19225, Culture=neutral, PublicKeyToken=null
System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
GalaSoft.MvvmLight, Version=5.3.0.19038, Culture=neutral, PublicKeyToken=0e453835af4ee6ce
System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
SimpleInjector, Version=3.2.2.0, Culture=neutral, PublicKeyToken=984cb50dea722e99
System.Runtime, Version=2.6.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
mscorlib.resources, Version=4.0.0.0, Culture=ja, PublicKeyToken=b77a5c561934e089
Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
SimpleInjector.Compiled, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
PresentationFramework.Aero, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Threading.Tasks, Version=2.6.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.Threading.Tasks, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Deployment, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Deployment.resources, Version=4.0.0.0, Culture=ja, PublicKeyToken=b03f5f7f11d50a3a
RPPLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Transactions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Data.DataSetExtensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
PresentationCore.resources, Version=4.0.0.0, Culture=ja, PublicKeyToken=31bf3856ad364e35
PresentationFramework-SystemXml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
UIAutomationTypes, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
System.Windows.Forms.resources, Version=4.0.0.0, Culture=ja, PublicKeyToken=b77a5c561934e089
Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
WindowsFormsIntegration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
HtmlAgilityPack, Version=1.4.9.5, Culture=neutral, PublicKeyToken=bd319b19eaf3b43a
System.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a