Rookit dl4 Infection, Recovery Question

Hi, I was infected by "rootkit.win32.TDSS.tdl4" virus, which Kaspersky's
TDSSKiller found, and said it had cured it.
The major symptoms of the attack (excessive CPU usage by SVCHOST.exe -
ntsvcs, unable to run Windows Update and lots of error messages from Rapport banking software with "Blocked process alteration events".)

I'm still getting some suspicious activity (a few error messages in Rapport
about "attempt to alter function URLDownLoadToFileW blocked", and every time I boot up there are attempts to communicate with IP adddress 221.192.199.49 which when I google it looks like a very active Chinese hacker!).

I have a firewall rule blocking all communications with this IP address and
a few others that were appearing in the Norton Firewall Activity log around
the time of my infection.

Question: I have an 7 year old DELL machine with the Dell PC Restore
partition, so I have the option to return my main partition to the pristine
state it was in when it left the factory. (with XP sp1!!). Is this a viable
recovery option with this sort of infection??

This link describes the inner workings of the Restore
http://www.goodells.net/dellrestore/.

The alternative looks like going into a complicated comboFix. At least with
the Delll restore it just allows me to run mormal windows updates etc. plus
backing up data.

Many thanks for your help