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This might help with the scanner issue ,
I`ve recently "upgraded" one of My ancient computers to Windows 7 and had a similar problem with finding a driver for a pci slot scsi controler and the Vista fix worked nicely . Worth a try at least
Alternatively, you can install VueScan (free) which has support for legacy scanners via its own drivers: http://www.hamrick.com/vuescan/hp_scanjet_5300c.html