Hi Welcome to FixYa!
You dont have to worry if you don't have the CD for the installer of your printer anymore. The installer can be downloaded anytime from Lexmark's website. Copy and paste this link to your browser:
http://support.lexmark.com/index?locale=EN&page=product&userlocale=EN_US&productCode=LEXMARK_X2350&focusedTab=DOWNLOADS#1
Just select what version of Windows and the system type you have on your computer. If you are not sure what it is, follow the steps below:
1a)If you have Windows XP:
-Click on Start>Run>Type "msinfo32" on the run box then click OK. You should be seeing something like this.
1b)If you have Windows Vista or Windows 7, just simply click on Start>then on the search box right above it, also type "msinfo32" then press enter. The System Information window for Vista and 7 looks like this:
2)Those windows will be showing you the system information of your computer. The information that we need would be the OS Name and system type.
3)Now we will be able to check whether what type of driver we will be downloading. If the system type is x86, it means that it is a 32bit system. if its x64, obviously its a 64bit.
4)After you have selected the correct OS and version, click on Filter.
5)Click on the link below Recommended Downloads. It will pop up another window for the driver download.
6)Just download the driver, and run it afterwards.
7)It will now install the driver and software for your Lexmark printer.
Hope this could help!