Security experts at Secunia have revealed that 98.09% of PCs have one or more insecure programs installed, which is an increase from 95.46% at the start of 2008. The data was collected from the first run of Secunia's PSI security software on 20,000 PCs:


It's worth noting that "insecure programs" refers to software that is known to have vulnerabilities. A vulnerability in a program can be exploited by hackers to do anything from compromising a PC, to automatically install Trojans/Viruses, to sniff out private information. We suspect that the test didn't include computer operating systems *cough*.