Home Desktop pc win 7 video files

The Win 7 PC at home has 3 hard disks physically in it.  Only 2 are connected.
We do not want to boot from the older two because both are virus infested.


Power on
Press F8
Boot devices offered are:                         This info came from the device manager
P2: WDC WD1002FAEX-00Y9A0   <-- br="" c="" drive="">
P3: WDC WD20EZRX-00D8PB0    <--f at="" br="" drive="" present="">
P4: HL-DT-ST DVDRAM...            <-- drive="" dvd="" p="">
The Plan:
1.  Power off
2.  Disconnect WDC WD20EZRX-00D8PB0
3.  Connect the old original HD.
4.  Power on
5.  Press F8
6.   Select boot from  WDC WD1002FAEX-00Y9A0
7.   Copy video files off.
8.   Copy anything else off.
9.  What next

Execution:
Pressed F8 and we get:
P2: WDC WD1002FAEX-00Y9A   <-- br="" good="" is="" this="">
P3: ST2000DL003-9VT166
Selected to boot from P2
The computer wats to use CHKDSK
Deleting corrupt attribute records....
This could take a while.  We are at 4% now.