I'm sorry but support for both VirusScan 4 and Windows 98 was withdrawn ages ago and no removal instructions exist other than the normal method, whatever that is as I am not familiar with Windows 98.
If the machine is capable I strongly recommend installing a supported operating system.
If I find anything I will let you know but don't hold your breath.
OK, courtesy of Grif one of our Moderators from an old post regarding old VirusScan Enterprise but the procedure should be the same for the home version.:
Manually Removing McAfee VirusScan 4.0.x
IMPORTANT: Before beginning to remove VirusScan manually from your computer be sure to backup the Registry. This will safeguard your Windows installation. You can recover your Windows configuration by restoring the backup if something goes wrong.
The instructions in this document will guide you through deleting specific items from your computer. If you are instructed to delete an item that you cannot find, skip that step and continue with the next step. Some steps may not be applicable to your installation of VirusScan.
How to Backup the Registry
1. Click on the Start button.
2. Click on Run.
3. Type in REGEDIT then click OK. The Registry Editor will then appear.
4. Click on the Registry pull-down menu then click on Export Registry File. The Export Registry File dialog box will then appear.
5. In the File Name field type 'backup' (without the quotation marks).
6. In the Save In field be sure that Desktop is selected (if it is not, click on the pull-down arrow and select 'Desktop.')
7. Select 'All' in the Export Range groupbox.
8. Click on the Save button.
You now have a backup of your Registry saved as 'backup' on your desktop.
NOTE: If you need to restore the Registry you can double-click on the 'backup' file you created and it will be restored. However, after finishing your editing and testing to be sure all is running properly, please delete the 'backup' file so that the old registry is not accidentally restored.
How to Edit the Registry
1. Click the plus sign (+) next to HKEY_LOCAL_MACHINE.
2. Click the plus sign (+) next to System.
3. Click the plus sign (+) next to CurrentControlSet.
4. Click the plus sign (+) next to Services.
5. Click the plus sign (+) next to VxD.
6. Single-click on VSHINIT so it is highlighted, then press the Delete key on the keyboard to remove this entry.
7. Now going back up the tree structure, click the minus sign (-) next to VxD.
8. Click the minus sign (-) next to Services.
9. Click the minus sign (-) next to CurrentControlSet.
10. Click the minus sign (-) next to System.
11. Click the plus sign (+) next to Software.
12. Single-click on McAfee so it is highlighted, then press the Delete key on the keyboard to remove this entry.
13. Click the plus sign (+) next to Microsoft.
14. Scroll down and click the plus sign (+) next to Windows.
15. Click the plus sign (+) next to CurrentVersion.
16. Single-click on Run so it is highlighted.
17. On the right side of the window, highlight and delete the following entries:
18. On the left side of the window, single-click on RunServices so it is highlighted.
19. Highlight Vshwin32EXE in the right window and press Delete. Highlight McAfeeWebScanX in the right window and press Delete.
20. On the left side of the window, click the plus sign (+) next to Uninstall.
21. Highlight and delete the McAfee VirusScan folder.
22. Now going back up the tree structure, click the minus sign (-) next to Uninstall.
23. Locate the folder named SharedDLLs. Left-click once on the name of this folder so it is highlighted. Now look on the right side of the screen. You will notice there is a Name column and a Data column. Locate the following items under the Name column and delete them.
NOTE: In order to view the entire length of the name column you will need to increase the size of the Registry Editor window so it fills your whole screen. You may also need to increase the length of the Name column by left-clicking the divider line located between the Name and Data column headings, holding down the mouse button, and dragging the divider line to the right.
24. If VirusScan 4.0.x is running on a network with a Microsoft Exchange Server, do the following, otherwise skip to the next step:
Moving back up the tree structure, on the left side of the screen, locate CurrentVersion and left click on the minus sign (-) next to it.
Locate Windows and click on the minus sign (-) next to it.
Click the plus sign (+) next to Exchange.
Click the plus sign (+) next to Client.
Single-click on Extensions so it is highlighted.
On the right side of the window, highlight and delete Exchange Scan.
25. Close the Registry Editor by clicking on the X in the top right corner.
How to Edit the AUTOEXEC.BAT File
1. Click on the Start button.
2. Click on Run.
3. Type in SYSEDIT then click OK. The System Configuration Editor window will appear. The top window will be labeled C:\AUTOEXEC.BAT
4. Delete the following lines (if they exist) by highlighting the line and then pushing the Delete key on the keyboard:
@IF ERRORLEVEL 1 PAUSE
REM Environment Settings For McAfee VirusScan
5. Close the System Configuration Editor by clicking the X in the top right corner of the large window. You will be asked if you wish to save changes. Answer Yes.
Restart your computer.
How to Delete McAfee VirusScan Files
1. Double click the My Computer icon on the Desktop.
2. Double click the C: drive.
3. Double click the Program Files folder.
4. Double click on the Network Associates folder.
5. Single click on the McAfee VirusScan folder so it is highlighted.
6. Press the Delete key on your keyboard.
7. A box will appear asking you if you're sure that you want to delete these files. Click the Yes button.
8. Once the folder is deleted close all open windows until you are back on your desktop.
How to Delete the McAfee VxD Files
1. Click on the Start button.
2. Highlight Find then click on Files or Folders. The Find Files dialog box will then appear.
3. In the Named field type in MCAFECOM.DLL then click the Find Now button.
4. The computer will then search for the file. When the file is found it will be displayed at the bottom of the dialog box.
5. Once the file is found right-click on the small icon to the left of the file's name. A pop-up menu will appear.
6. Left-click on Delete to delete the file. Answer Yes to any prompts about deleting the file.
6. Repeat steps 3 - 6 for the following files: MCKRNL.VXD, MCSCAN32.VXD, MCUTIL.VXD, VSHIELD.VXD, VSHINIT.VXD.
7. Once all of these files have been deleted close the Find Files dialog box by clicking the X in the top right corner.
How to Remove McAfee VirusScan Shortcuts
1. Right click on the McAfee VirusScan Central shortcut on the desktop (if it exists).
2. A pop-up menu will appear. Left-click on Delete to remove this shortcut.
3. Click on the Start button.
4. Highlight Settings then click on Taskbar & Start Menu. 5. The Taskbar Properties dialog box will then appear.
6. Click on the Start Menu Programs tab.
7. Click the Remove button. You will then see a list of several folders and shortcuts.
8. Locate the McAfee VirusScan folder and single click on it so it is highlighted.
9. Click the Remove button to delete this folder.
10.Click the Close button followed by the OK button.
VirusScan 4.0.x has now been removed from your computer.
Thanks Ex_Brit very much for the info!
I will get to work on this and try and see how things go. Just trying to put a new anti-virus program on it but first the old one has to go.
Again thanks for the help,much appreciated!