Back in early 2003, probably February, 2003 I ended up getting the W32.Pinfi virus
and the virus spreaded to over 100 program files and the virus corrupted some program files on my secondary HDD!!! The virus caused me to get an error when launching setup archive files and thus some programs terminated, because the virus appends junk data to the end of Windows program files and I was required to redownload some software, again, because even when the anti-virus software removed the virus from the program files, because the CRC was changed, some programs would still give me an error message and terminate anyways, because they detected the file change. The W32.Pinfi virus is dangerous, because the virus can spread to over 200 files within a short time. The virus also created a temporary file that Windows won't let me delete.