do you have another log in on the PC u can try?
according to the IT chap at work its something to do with passwords...or registry ( he thinks) hes now checking it out
ok he thinks it MIGHT be the sasser worm/virus.....download this FREE microsoft malware tool.
Malware, Malicious Software...
would it be images from an iphone 4s? as there is a known problem with them not being completable with some versions of Windows 7 when viewed in picture gallery.
what error are you getting?