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Cause of Kaspersky Error Code 27300 Step 1:Download of corrupt files. Step 2:Bad Internet connection. Step 3:Random crashing of device drivers. Step 5:Incomplete installation because of some external factors. Symptoms of Error 27300 Kaspersky Installation Error Step 1:You will notice the computer being frozen for too long. Step 2:The performance would be slow. Step 3:Programs running on your computer would crash often. Fix Kaspersky Error Code 27300 METHOD 1: REPAIR REGISTRY Step 1:Open the Run command (Windows + R). Step 2:Type regedit in the Run Open field and press the Enter button. Step 3:The Registry Editor window will open. Step 4:Scroll through the applications and select the registry for Kaspersky antivirus. Step 5:Click Export.