I cannot extract any compressed files. Whether rar or any type. I have tried, turning UAC off, using winzip, winrar, 7z, and I also reinstalled Windows 7 and formatted it. The case is with all compressed files, not with only one or two, With ALL.
Try to search on web for a zip repair tool.
You need to find the source of the problem:
What happens if you compress the file on the laptop and try to unzip it on the pc?
What happens if you transfer the uncompressed file from the laptop to the PC, compress it on the PC and try to unzip it back on the pc?
I had this same problem when I was pushing my overclock to the limit. CRC errors when decompressing archives... I believe your system is not stable, even if you're running at stock speeds. I'd start by running Memtest to verify that your RAM is OK. My suspicion is that one of your DIMM's is bad.