My PC is a whore!

When "my" PC got infected with malware a few weeks ago, i had problems finding out how it got infected. Its rare for the PC to get "uncontrollably" infected by a virus, worm, trojan or malware. I always keep the anti-virus updated and im always careful with possible sources of infection. Most of the time, when the PC gets infected, i know the source. And knowing the source is very important because you need to have the source of the infection virus-scanned so you wont get infected again. Thats why i was very concerned when i found out the PC got infected with malware (which was hard to remove since the anti-virus cant fix it (or detect it at that time). I had to search various online forums that could instruct me on how to "manually" remove it).

Anyway, after a week of trying to fix it, i finally removed the malware (which runs a CMIII program in the background and prevents you from opening your hard drives with an ordinary left click, and i think also prevents you from safely removing flash disks and probably other USB port devices). It took me a week because i had a class everyday, and i needed hours of trying to figure out how to remove it, and another set of hours allocated for a "worst case scenario" (i.e. Reformat the C: drive!) so i also had to back up some files. Anyway, like i said, removing the malware was a success. But that wasnt enough, i need to find the source. Thats when i thought, my PC is a whore (or like a whore) and got infected with a reversible STD. Why? Because what made it difficult for me to find the source is that many people use the PC. Not only my siblings but also my cousins. And they check their emails there and insert their flash disks too. its hard to check and figure out who inserted the offensive instrument in the slot. So one of us must be the carrier of the horrible malware. So the question now was who? Who inserted the infected flash disk in the PC's usb slot. Or dowloaded an infected email and let the malware loose inside the PC. Anyway, im still not sure who the infected carrier is but at least my PC is clean again. And the anti-virus can detect the malware now (and the anti-virus is like a condom and it just so happens that at the time the PC got infected, the "condom was defective", meaning the antivirus was not updated enough to handle the malware). If the PC was a PC in a computer shop, i would say the PC is like a prostitute and not a whore since you have to pay for the services the PC offers.