https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/MG7550-unable-to-select-twain-source/m-p/165098#M41920 <P>Trying to scan from PC running windows 7 with USB connection using CanonScan, However cannot connect to scanner. I get message 'Unable to select TWAIN source'. Have read alot on internet about this type of problem but nothing specifically for this scanner. Not sure what files should be in Twain_32 folder (currently a single file called 'wiatwain.ds')&nbsp;some posts have sugggested adding a new path to System Variables however no one has said what the path should be named. Anyone help?</P> Sun, 21 Feb 2016 18:09:57 GMT ontopofmalvern 2016-02-21T18:09:57Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/MG7550-unable-to-select-twain-source/m-p/165098#M41920 <P>Trying to scan from PC running windows 7 with USB connection using CanonScan, However cannot connect to scanner. I get message 'Unable to select TWAIN source'. Have read alot on internet about this type of problem but nothing specifically for this scanner. Not sure what files should be in Twain_32 folder (currently a single file called 'wiatwain.ds')&nbsp;some posts have sugggested adding a new path to System Variables however no one has said what the path should be named. Anyone help?</P> Sun, 21 Feb 2016 18:09:57 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/MG7550-unable-to-select-twain-source/m-p/165098#M41920 ontopofmalvern 2016-02-21T18:09:57Z