There are many stories regarding SP2 problems. I've even beta-tested it, and now I'm running the main release version that you are using.
I found that I needed to update Norton Antivirus after installing SP2, because it didn't recognise that I had any antivirus! :?
I've not encountered any problems with the Google toolbar since installing SP2 - I would suggest you check the
Microsoft Windows Update site to see if there any hardware or software updates available after installing SP2. I found a new graphics card driver and Realtek ethernet card driver for my computer.
One annoying problem is the Auto Update feature, if you have installed an update - a box appears roughly every 10 minutes saying your PC will restart in 5 minutes. This could lose your work, if you left your PC unattended! :?
Apart from these few issues, I haven't found any other problems - yet!