My computer won't open any applications with the internet plugged in. When I start up my computer without the internet in it lets me in fine but when I start it with the internet in it just stays at the welcome screen when I put in my password. I can't open any applications with the internet plugged in. My computer was running fine yesterday and I haven't downloaded anything since. I have no idea what the problem is.
Your computer may be hacked/infected, so run it in Safe Mode, disable the Startup applications in Start \ Run \ type; msconfig and press Enter... go to Startup tab and uncheck all except for the antivirus, and delete all user Temp files in Start \ Run \ type: %temp% and press Enter, next again in Start\Run type: temp and press Enter, and delete all Windows temp files.
Next restart the computer and again login in Safe Mode this time in Safe Mode with Networking... and next run Online virus-malware scanns... After this you can try loging in normal mode.