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This sounds like a USB issue to me. I have had similar issues with combinations of cameras - that is I cannot use my QHY5 and 145M on the same machine.
Re-installing windoze is a bit drastic but will restore you to a known condition, surgery in the registry is an alternate but is not guaranteed to work, FWIW here is a sequence that will clean up USB configs (back up your files first!):
WARNING Not for the faint hearted - use at own RISK! - and I do not think it will work for Vista...
Step 1: Remove Hidden Devices
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1. Open a Command Prompt.
2. Type set DEVMGR_SHOW_DETAILS=1 and press Enter.
3. Type set DEVMGR_SHOW_NONPRESENT_DEVICES=1 and Press Enter
4. Type start devmgmt.msc and click press Enter.
5. Click View. Click Show hidden devices.
6. Click + to expand devices, Unknown devices and USB devices.
7. Look for USB devices and unknown devices (including grayed out devices)? Right click it and click Uninstall them.
Step 2: Remove all oem*.inf files
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1. Open a command box
2. At the command line, type in the following :
cd \windows\inf
ren infcache.1 *.old
ren oem*.inf *.old
del C:\windows\setupapi.log
exit
Step 3: Removing all entries under HKEY_LOCAL_MACHINE/Enum/USB that start with VID using REGEDIT.
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Removing the VID entries from the registry will cause them to be redetected at restart.
CAUTION: If you have a USB keyboard, mouse, scanners, and other things you know are working, do not remove the VID entry for these devices, otherwise, Windows may not restart correctly.
1. Click Start and click Run. Type regedit and click OK. The Registry Editor window will open.
2. Go to HKEY_LOCAL_MACHINE\System\CurrentCo ntrolSet\Enum\USB.
3. Highlight and delete all the VID_.... entries for usb devices that you cannot identify. Remember not to delete the entries mentioned above.
4. Restart your compuer.
Step 4: Reconnect the USB device that was not previously working.
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Windows should automatically reinstall the drivers.
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