WinRar not extracting

for some reason, every time I download a ISO file from anywhere, it'll get to around 60-90 % finished extracting, and then a message will pop up saying there was a read error. I don't understand whats wrong since, I was able to download ISOs just last week. But now, no ISO files will work.....

Try 7zip...it works just as good.

thats strange, check the size of the file you have against the size of the file you were downloading, if they aren't the same then its likely your downloads are corrupting, hence why they wont extract.

Clear cache etc., use different browser etc.

I tried using 7zip but all it does when extracting it'll get to 7 or 6 % finished and then the kb/s speed will slowly decrease until it shows an error message saying:Data Error (cyclic redundancy check).............yeah i have no idea what to do. Because I then try to play the ISO on ePSXe, and it'll just stay on a black screen........

Do as Almo said.

well I checked and I saw that the size from the page the size was 327.6 mb, while when downloading it said _out of 328 MB.I highly doubt that's the problem though....