Hi, I am using Windows Service Pack 3 and everything was working fine, but today when I opened a DOS file second time, I got an error " Another program is currently using this file". And it continues for every DOS file. Even I tried to open them in command prompt, but even there I am getting the same error. Can you please help me for this as I have to use DOS files many times a day. Thanking you. I downloaded the HJT Software and run a scan, so I got a log file which is attached herewith. Hope anyone will guide me further.