30 day trial version.
If you want a strong protection against adware, spyware and other threats, PestBlock is a good choice, because it can scan your system and warn you about any problems related to malware.
PestBlock offers you a good program in a well-organized interface that can be skinny so you can choose its appearance. But look is not as important as security, and that makes PestBlock specially useful, it's really good protection for your system and your data.
Spyware and adware will keep you away from your computer if you download and install PestBlock.
Finally, it is very fast during scanning, so you will save some time.