I don't know what is wrong. I checked all the programs and reinstalled them. Windows XP is installed new on here also, and I never had a problem like this.
Some of the programs, such as setups or even the task manager, are closing after a few seconds. I can't do anything in them.
Is there anything I can do to solve this, or do I have to reinstall?

Oh yea.. one more thing:
Sometimes it quits installers and deletes the "install.exe"
WTF is going on here?