Do you want to reset trail period of Kaspersky Antivirus?

Follow the given instruction

Step 1. Right click KasperskyPURE tray icon -> Settings -> Self-Defence -> disable Self-Defence -> ok
Step 2. Right click KasperskyPURE tray icon -> Exit -> Yes
Step 3. XP Users:
Start -> Run -> regedit -> go to HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\protected\AVP9\environment

Vista/7 Users :
Start -> Run -> regedit -> go to HKLM\SOFTWARE\KasperskyLab\protected\AVP9\environment

Step 4. Right click PCID and select Modify
Step 5. Change the last 3 digits of the binary dat to 3 different digits.
Step 6. Exit Regedit and restart for changes to take affect.
Step 7. Double click Kaspersky PURE system tray icon -> License -> in License Manager activate trial key for 30 days
Step 8. Right click KasperskyPURE tray icon -> Settings -> Self-Defence -> enable Self-Defence -> ok
Step 9. Curse Kaspersky for making it so hard! :P