I'm guessing when you say you "upgraded" from Win98 to Winxp, you installed WinXP 
over Win98 rather than doing a clean install of Win98.

Therefore: Try renaming the file c:\windows\inf\infcache.1 to infcache.bak, then 
rebooting.

Windows will create a new infcache.1 file from scratch as you reboot.

Then try installing the camera using the Windows XP drivers.

Come back and let us know whether it worked...






On Saturday, May 10, 2008 at 6:11 am, avp217 wrote:

>I usually can figure out a problem by experimenting and/or checking forums, but 
this 

>one has been driving me crazy for years, and I can't find a solution anywhere.

>

>The problem is, I have a digital camera (Pentax Optio 330, several years old) which 

>I cannot install into Windows XP SP2 via USB, so that Windows XP views the camera 

>as a removable disk drive.  I had no problem installing the drivers into Windows 

>98, but after I upgraded to XP, I had the problem.  I got a new homebrew computer 

>last year and transferred the XP license to it, with no luck.  The Found New Hardware 

>Wizard dies with

>

>Cannot Install this Hardware

>

>The hardware was not installed because the wizard cannot find the necessary software.

>

>The drivers are the same ones that have been on Pentax's website since the camera 

>came out.  The usual troubleshooting (update driver, uninstall device, etc.) doesn't 

>work.

>

>I have always circumvented this problem by using a card reader, but this means that 

>I have to remove and reinstall the CompactFlash memory card in the camera, and I'm 

>concerned that the card may be wearing out.

>

>The kicker came when I connected my daughter's camera (a newer one, a Nikon Coolpix) 

>to the computer and XP recognized it right away.

>

>I contacted Pentax, who just directed me to reinstall the existing drivers.  Then 

>I installed a fresh copy of Windows XP into an emulator (QEMU running under Linux), 

>and, once I figured out how to get QEMU to present the USB port to the guest operating 

>system, connected the camera.  Success!

>

>So, I suspect REGISTRY CORRUPTION in my real version of XP.  My emulated XP cannot 

>by my permanent one (I have to delete it since I can't activate it), and I have 
too 

>much invested in my real XP to rebuild it on account of this problem.  I'm looking 

>for a registry fix that will allow it to recognize the camera.

>

>I discovered a file (c:\windows\setupapi.log) that contains messages related to 
hardware 

>installs, and a registry entry (key, HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup; 

>data, LogLevel, data type, REG_DWORD, value, 0xFFFF) to turn on verbose mode in 
setupapi.log. 

> I have logs for both the successful install (in the emulated machine) and the unsuccessful 

>install (in the native machine) if anyone is interested in looking at them.

>

>If you've made it to the end of this post, thanks! 

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