when my pc starts up there is a message ---checking the system in C.Type of
file system NTFS, Volume Label is Vista.

then CHDSK is verfying files (stage 1 0f 3)
5% complete (70785 of 125952 file records processed)
After about 3mins the welcome to vista screen comes up and the windows
programmes are open.
How do I stop this ocurring repeatedley??
DavidA.