I have the same printer, Windows Vista, and also only use the device drivers, but do not experience the problem you are having. The only problem I have with it is that scanning using MS Office 2007 times out before the image can completely transfer. So uninstalling your existing drivers and then reinstalling may do the trick.
If you still wish to install the All-In-One Center software, Lexmark will only provide the device drivers, as you have discovered. However, there are reports that the Lexmark X6100 series AIO (All-In-One) is identical to the Dell A960 AIO. And, fortunately, Dell is kind enough to provide the similar All-In-One Center software.
Click here for the 32-bit Windows XP version. (just in case)
Click here for the 32-bit Windows Vista version.
Give it a try and please report back as to whether or not it worked for you.
documents stay in queue and do not print on my lexmark x1270m.
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