I had some trouble scanning directly into MS Photoeditor. When I opened the scanner from with MS Photo, the scan would proceed but then lockup both this program and the twain driver. Other programs, like Adobe Photoshop, work OK. This might be because Photoeditor isn't designed for big files. What I did was set the default scan to application to Photoeditor and this works OK. When I want to scan, I right mouse click on the scanner icon in the tray and start Vistascan. Click on the preferences icon, right next to the mininmize bar, and pick the scan to application you prefer. The default is Presto, which I didn't want to use.
One more tip: don't use the 3.7 drivers that are available at the Umax UK site. The drivers on this disk, 3.54, work OK in Windows 98. If you have previous scanner installs in your computer, you might delete any twain information from these scanners.