I have an acer extensa 4620z laptop with vista homebasic installed when i got it i then put vista ultimate SP1 without formating ( just upgrading ) after this everything was fine but i wanted to see how windows 7 was so after installing it i faced problems like the computer shuting down suddenly when i went to change back to windows vista it gives me a message saying - (the program can't start because WDSUTIL.dll is missing from your computer .try reinstalling the program to fix this problem). and then says that ( the file 'autorun.dll' could not be loaded or is corrupt , setup cannot continue.error code is [0x7E]. i want to change back to vista ultimate. thanking you
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