Based on personal experience, I don’t recommend staying with 7.5. Particularly if you browse family unfriendly sites.
Also, if you read the list of sites blocked by Spyware Blaster, half of them promise Anti-virus or anti-spyware programs. The lesson there is to read reviews and choose products wisely. Legitimate anti-virus vendors do not use popups and spam.
The guys whose computers I restored got a popup message in an email telling them a virus had been detected. They clicked OK to clean it and the result was total destruction of Windows.
In this day and age, that should have been a no-brainer.