Adept said:For those of you using Firefox, there are two potential problems.
1 - Firefox will randomly stop copying, and restarting the program will help. This occurs with all operating systems and Mozilla products.
2 - The other problem is not a bug, but is caused by malware on your machine. This only occurs on Windows PCs and results in a complete inability to copy and past in Firefox.
To solve the first problem, go to http://www.mozilla.com/firefox/upgrade-2.html and upgrade to Firefox 1.5.0.4
The second problem is a bit trickier.
1 - IMPORTANT! Close all Firefox, Opera and Internet Explorer windows.
2 - Click on start
3 - Click on 'run'
4 - Type regedit.exe and hit OK.
5 - Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\Current Version\Windows
6 - On the right hand side you should see a string called AppInit_DLLs with a value of pushow*.dll (*will be a random number)
7 - Right click and delete this string, then exit regedit.
8 - Open windows explorer
9 - Browse to C:\windows\system32\
10 - In that folder there will be a file called pushow*.dll where the * is the same number you saw above. Delete all pushow*.dll files.
And you're done!
Great tip!!!
For the trickier path...I would strongly recommend this step to backup the registry:
4(a) - Right-click on HKEY_LOCAL_MACHINE, click Export. Name your exported file "Backup of HKEY_LOCAL_MACHINE"