dears all,

i had already downloaded many packages from bioconductor...i reinstalled windows and before that copied the file containing those packages from C:\Users\mu\AppData\Local\Temp\RtmpSszekT\downloaded_packages
.....now, i opened R and from the install packeg (s) from local zip file option, loaded affy package, it sadid that:

> utils:::menuInstallLocal()
package ‘affy’ successfully unpacked and MD5 sums checked
> library(affy)
Error: package ‘BiocGenerics’ required by ‘affy’ could not be found
what can i do not have to redownload these packages again and use them please???

The error message is pretty straightforward; you're missing an installation of the BiocGenerics package. You'll have to install that (and probably a bunch of other dependencies) before affy can be successfully loaded. This seems like a time-consuming and painful effort. Whenever I update R, I just re-install everything using the recommended biocLite approach. This ensures that the correct versions of all packages and their dependencies are installed for that version of R. Of course, it involves re-downloading everything, but I reckon my time is worth more than the institute's bandwidth, so that's okay with me.

Dear sa63_tanha, 

have you tried to manually unpack all of your saved packages into the library directory of the "R"? 
By me, it is "[...]\Documents\R\R-3.2.0\library"

After that, try to load your library using library(affy) command, and it should work.

thank you bot Aaron and Dimitri,

then Aaron, you mean me better re-download the packages...

thank you Aaron