Hi All, Well I got my system working and added several programs that I use and added something that didn't agree with my system. I'm using Vista Home Premium SP1 64bit. I bought the OEM so I'm not sure if I can reinstall it. Anyway I started getting the pop up message that Windows Explorer shut down and gave me the option to restart it or check on the web for solutions to the problem. I would click on restart and after a couple times it would start working. I did find a couple of viruses on my system and deleted them using NoAdware program. Now I get the message "Error Loading C:\Windows\System32\pmnkLDtu.dll, The specified module could not be found". Everything hangs when I go with a normal start and when I open the OS in safe mode. At least I was able to use the task manager to shut down. I've tried several different modes to enter the OS but nothing works. I have been unable to find out what pmnkLDtu.dll is, does anyone here know? Also any suggestions as to how to fix the problem, I can't even get into system restore. Last but not least, since I bought an OEM OS would I be able to reinstall it if I have to go that route? Thanks for reading this post and any suggestions will be more than welcomed, thanks!