When that floppy is accessed by a non-infected computer, the virus will likely transfer to the boot sector of your operating system. Other common ways to infect your computer with a virus are from interacting with the Internet and from running a program attached to your e-mail. The least likely way that you will ever get a virus is from the software author's home page. Always be careful and use a virus scanner on any new programs. A suggestion was made to me to a small partition on my hard drive and then place unopened shareware or suspected files onto the partition.
Shareware comes to the rescue here, too.
At the heart of any utility package is the anti-virus scanner, which is the program that actually looks for and identifies any viruses that may make their way onto your system. One nice feature with anti-virus programs is that most of the time they can actually delete the infection while rescuing the infected file. Anti-virus programs do several things for your computer. First, they scan your files for any known viruses, even if they are compressed into an archive. Second, they scan your system on bootup, making sure that you have no boot viruses.