After 3-4 minutes from start, I receive a message that my computer will shut down in 30 sec. What should I do?

Go to start> run> type in shutdown -a (note the space between shutdown and -) then press ok.

Please download and install the latest version of HijackThis v2.0.2:

Download the HijackThis Installer from this link: HijackThis

1. Save " HJTInstall.exe" to your desktop.
2. Double click on HJTInstall.exe to run the program.
3. By default it will install to C:\Program Files\Trend Micro\HijackThis.
4. Accept the license agreement by clicking the "I Accept" button.
5.Click on the "Do a system scan and save a log file" button. It will scan and then ask you to save the log.
6. Click "Save log" to save the log file and then the log will open in Notepad.
7. Click on "Edit > Select All" then click on "Edit > Copy" to copy the entire contents of the log.
8. Paste the log in your next reply.
9. Do NOT have HijackThis fix anything yet! Most of what it finds will be harmless or even required.

Please download ComboFix to the desktop from this link:

http://download.bleepingcomputer.com/sUBs/ComboFix.exe

Double-click combofix.exe
Follow the prompts.
(Don't click on the window while the program is running, it may cause your system to hang.)

Please post the log it produces.

Thank you, I'll do that and post the message in a few days. (I am moving in another place with my office)