Have little concept of computer software. System is Windows Vista Home Premium 64 bit. Bought Adobe 9 Pro. Use for electronic instead of paper printing; worked great until: attempted download in which ""download with" prompt appeared. Adobe only choice that made intuitive sense (other choices as best I recall were like Word, Exccel, Power Point. Clicked download with Adobe and nothing downloaded. Some seconds later majority of some 55 icons on desktop took on Adobe icon appearance (captions under icons remained unchanged. Documents in files did not seem to be affected and would open normally. Clicking on affected icons produced Adobe's opening screen with a notation that Adobe could not open this type file. In an effort to solve problem I uninstalled Adobe and 20-30 seconds before uninstall process completed, all icons returned to a correct display. Unfortunately, when I reinstalled Adobe (with my disc) all went well until some 10-15 seconds before installation finished at which a "wave" traveled down screen converting majority of icons to Adobe's emblem. Clicking on some of the apparently unaffected icons also resulted in Adobe initial screen opening with same notation. I have repeated the install and uninstall process 3-4 time and the results has been the same. Even after the icons change Adobe declares that installation has been successful and prompts for click finish.
This software as touted as being reputable and operating on many computers without such problems.