Recommend light weight PDF reader please

PDF X-Change Viewer for me too. It also has got some basic editing features, very useful. You can also copy paste bitmaps to PDFs, export pages as bitmaps and generate an OCR layer for searching (when source is bitmapped).

Thanks to all who answered my question.
I have installed and tried:
Sumatra, light weight, but to me, the font didn't seem as clear as some of the others. (in my opinion of course)
Nitro, I liked, but a few people are having problems with the printing side of this software.
I've decided to keep for a while, PDF X-Change, this has a bigger footprint than I would have liked, but I've just upgraded to a larger SSD, and I like the look of this program.
I might go back to Nitro when they iron out the printing problems.
Thanks again for all the replies!

@Cornishman. You can always open a elevated command prompt and do a:

compact /S:"C:\Program Files\Tracker Software" /C /I /EXE:LZX if you are low on free space.

Heck, I have done that to all my Program Files folders and got almost 5 GB back. The main drawback is that you must reissue the command again after updating because the new data gets written in uncompressed form. As for the bright side, I am doing this on a regular mechanical hard drive, so the tiny performance hit for loading apps compressed should be even tinier on a ssd.

Just specifying a folder name with no other options for the compact command gives a report about compression status.
For me the PDF Xchange Viewer goes from 39,32 MB to 16,31 MB. It takes about 5s to launch.