Hi all. Long story behind this,but question is: is there anyway to reinstall or repair damaged MMC and Taskmanager in XP Pro without reinstalling the OP. ThanksCheck how your mouse is mapped, you may have it mapped so your left click sends you back a page (I have the same set up, but on the two side butyons on my mouse)Tnx fr reply , appreciate it but I have a fairly strong background in OS's. Need someone with a much more in depth knowledge. Tnx.Might try this...

Downloading and installing the MMC 3.0 for Windows XP is a breeze. However, you must manually ENABLE the new user interface by adding a key to the registry. Here's how:
1.Download the Microsoft Management Console 3.0 for Windows XP from the Microsoft Download Center.
2.Locate and run the WindowsXP-KB907265-x86-ENU.exe executable file to LAUNCH the MMC 3.0 installation wizard.
3.Once the installation is complete, launch the Registry Editor (Regedit.exe).
4.Go to HKEY_LOCAL_MACHINE\ SOFTWARE\Microsoft\MMC.
5.Right-click the MMC subkey and select New | Key.
6.Name the key UseNewUI and press [Enter].
7.Close the Registry Editor.
Now when you launch MMC.exe from the Run dialog BOX, you'll be able to take advantage of the new Add or Remove Snap-ins interface. You simply scroll through the available snap-ins in the left panel and click the Add button to build your custom console in the right panel.
Notes: This tip applies to both Windows XP Home and Professional, but requires that SERVICE Pack 2 is installed.

What caused this current issue / when did it happen? A lot more info would be helpful.

Alan <>< Hi Ale52. Tnx fr the fix. It worked. Messing around with a software RAID on an AsusP4P800D board and didn't know enough.DUMM.Sorry,one other thing. I find that the Group Policy snap-in will not install. Eeeor code is: CSID: {8fcob734-aoe1-1101-a7o3-0000f8757le3}. Any thoughts? Thanks