"Oftentimes without their knowledge, these other programs will piggyback on like a parasite and install on your system."

Not all programs will install if they don't support Windows 7.

The programs install themselves in several places on your computer, making it difficult to find and delete them.

The program in 2007 installed the well infrastructure and conducted a short production test.

Before making this call, the program can install one or several interrupt handlers pointing into itself, so that it can be called again.

The program installs itself and is set up to run as a background process or daemon which remains undetectable to the computer user.

The program has installed 118 Doppler radar stations across the United States.

The program could install itself in, or infect, other system objects.

"If two programs installed the same file in the same folder, one copy would overwrite the other."

Such programs install themselves on a PC and try to send information over the Internet without the owner's awareness.