I have a HP laptop and yesterday I turned it on and it started but once start-up was complete, I couldn't open anything. I tried opening an internet browser, documents, and then my anti-virus software but nothing was happening. I restarted my computer and opened it in Safe Mode where I ran my AVG Anti-Virus software and it didn't find anything. So I restarted in regular mode and again nothing would open (I tried this several times). I am the only one who uses this computer and I haven't downloaded anything or gone to any unusual websites. Could I have a virus? Help me please!