How can i fix what looks like a virus on laptop? I cannot get to my desktop fom start up or use task manager?

when I load up my pc it show my desktop like normal but before I can do anything, what looks like, Internet explorer pops up followed by a Virus detection screen. This has no "x" in the corner to close the window, takes up the whole screen and I cannot alt cnt del out of it either, only option is on the virus warning it asks if i want to go to my homepage, when I click this it takes me to ask.com (not my usual homepage), this again takes up the full screen and I cannot close the window, hitting escape does nothing and when I use alt control del here it takes me to the selection screen I would normally find (with task manager / switch user etc) but the task manager option is not there. I only had this today so have not had a chance to look at it properly yet, I am thinking abuot trying to get in using safe mode but have no idea what to start looking at to prevent / clear laptop of. I have looked everywhere on the internet for similar problems but have not found anyone with same symptoms. I cannot access my desktop or start menu when I load up normally so safe mode seems only way to fix? any comments advice would be great thanks in advance
Answer:

This happened to me last year and wiping my hard drive and reinstalling windows fixed it for me. Its a pain, but its worth it as any lingering viruses will be wiped and windows reinstalled and cleared of any bugs

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