Update all drivers from the system manufacturer's website. Even if they seem to be current, update them anyway.
Then update any programs that you may have installed (particularly antivirus/antispyware/fireswall programs), such as your NOD32.
The most common problem with Service Packs are:
- malware infections
- older (incompatible) 3rd party drivers
When a Service Pack first comes out, I don't suggest using the PC Manufacturer's website to update drivers. But after the Service Pack has been out for a couple of months the PC Manufacturer's usually have posted any new drivers that are needed - so it's OK to use then.