My computer is acting up :(

[Caroline]

edit

[100%]

The process
MDM.EXE seems to be the problem
look here
http://www.2-spyware.com/file-mdm-exe.html
This is a non-essential process - Turn it off.

The Microsoft Machine Debug Manager (mdm.exe) does not connect to the Internet itself. However, it is still a rather ill-behaved program that leaves scads of temporary files on the hard drive that it never deletes, and fails to unload properly (on shared computers, when a user logs on a new instance of mdm.exe may start, but it won't necessarily exit when the user logs off. Depending on how many users have used the PC since the last reboot, dozens of copies of this program could be simultaneously running, eating up CPU and memory!).
mdm.exe is known to cause crashes and fatal errors on some PCs using Dial-Up Networking.

also if it is found anywhere else than windows/system32 then it is a Trojan (and in your case......where is it.......?

How to turn off Machine Debug Manager in Office XP - http://support.microsoft.com/default...b;en-us;321410

How to Turn Off the Machine Debug Manager
If you run Microsoft Internet Explorer 5 or later, you can turn off the Machine Debug Manager by turning off script debugging. To do this, follow these steps:
1. Open Internet Explorer.
2. On the Tools menu, click Internet Options.
3. Click the Advanced tab.
4. Click to select the Disable script debugging check box, and then click OK.
5. Close Internet Explorer.
6. If you run Microsoft Windows 98 or Microsoft Windows Millennium Edition (Me), delete the registry value that starts the Machine Debug Manager. To do this, follow these steps.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
a. Click Start, and then click Run.
b. In the Open box, type regedit, and then click OK.
c. In the Registry Editor, locate the following subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
d. In the right pane, right-click MDM7, click Delete, and then click OK to confirm the deletion.

NOTE: The value for your version of the Machine Debug Manager may be different from MDM7.
e. Close the Registry Editor.

NOTE: Running Detect and Repair in Office 2000 adds the registry entry for the Machine Debug Manager and causes it to run at startup. If this occurs on your system, use the previous procedure to remove the registry entry.