Avast Error?

Hi Avast Team Hi, i just wanna ask something earlier when i was surfing the net, i hit my computer table on my knee cap then my computer table shook, then i just realize about how Hard Drives are sensitive, then when i click my task bar i saw my avast anti virus stopped revolving/spinning, then i restarted my laptop, and it was longer than usual in restarting mode, i waited until it went to my desktop. Then i check the latest time stomp of my windows folder i saw a bootstat(a dat file) and PFRO(a txt file), is this file windows error related? as of now nothing unusual on my laptop, and anything to worry about?

http://lmgtfy.com/?q=pfro