Dell inspiron 530s factory default?

Is there Anti-virus protection on the computer such as Avast? You may need to turn this off. Are you disabled from the net? Do so. From what you have given, you were in safe mode? We know you can get there. (F-2 after the Dell splash screen at start-up. Funny suspicion, you have malware in this computer enabling you from repairing it. System Restore should be able to take you back to a time before this happened. I would take a trip to Cnet and download Malware-Bytes to a disc on another computer. Inject it into the one you are working on in Safe Mode, and run it. Come out of Safe Mode and run it again in Windows if it fires up. If you have some files missing, you will have to go into Command Prompt and run a check disc program. Microsoft can help with the instructions. I am not sure of the OS you are running. A wild guess, Vista. Sorry for the briefness, each has it's own properties. If all else fails, I am told you can get a disc from Dell for this system at a price. Stories are some times not retold correctly. Links are below. Hope it helps.