I am worried about my PC, recently it had suddenly rebooted by itself while I was working and kept freezing as the desktop appeared on my screen. I had to keep turning it on and off until it would finally boot properly. I did a full system scan through Avira anti-virus and found this result shown twice and identified as a trojan - C:\WINDOWS\system32\dllcache\kernel32.dll. So I sent the result to Avira's official lab via email but they replied but telling me the result was proven to be a false positive and was harmless. Could it be something else affecting else causing this damage i.e. unidentified trojan horse? System: HP Pavilion 523a Windows XP Professional Version 2002 Service Pack 2 Intel(R) Celeron(R) CPU 1.80GHz 1.79GHz 512 MB of RAM PC is about six years old.