Intro: I've had two accounts potentially compromised over the past few weeks. My Origin account (for Battlefield 3) was compromised however I'm pretty sure this was because Ubisoft was compromised and hackers got email accounts and passwords. They used the same information around the same time as the compromise and thus I believe those two are related. However today I received an email from Steam reporting that someone had accessed my account and in order to confirm it I had to enter the code. I have since changed the password, but this lead me to wonder if my computer was actually compromised. I've had Windows Security Essentials installed, but I decided to install Comodo Firewall to make things more secure.
After installing Comodo, the following things would happen. I would begin receiving notifications about various applications trying to do things... apps like iSyncr (used for syncing iTunes music onto an Android phone), HWHydra (ATI software), and dfsvc.exe would attempt to access CurseClient (which was used for other games such as Rift, World of Warcraft, Skyrim, etc... a mod manager.
Around the time that these notifications would appear, the computer would stop responding. The cursor would just be a circle. If I was on Teamspeak 3, I could hear my teammates speak but I couldn't speak back to them. Ctrl+Alt+Del would allow me to bring up the task manager, however it would not load anything within that Window. I rebooted the computer into safe mode and disabled iSyncr, CurseClient, and maybe a few other things from msconfig. After rebooting, I would still have the same problem.
For some reason I guess Comodo is causing my computer to crash but won't allow me to restart explorer.exe. I would like to get this rectified so I can continue being secure and hopefully make sure I'm not compromised. I don't have any other symptoms of a compromise, however again I'm not sure. No unwanted apps that I see, no browser redirectors, nothing.