MS Tool to verify if u r running SP1 RTM Hi every body... there is a lot of confusions going over here whether u r running RTM version of Vista SP1. here is a tool from Microsoft though old but will clear ur doubts.

run it and see under windows tab what is the build lab. If it mentions

6001.longhorn_rtm.080118-1840 then u r running Sp1 RTM

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screen shot is also attached.