From: Teiresias on 06/29/1999
This may get a bit complicated, but I will try to explain as I go along.
This problem is caused by a built-in limitation in SHELLICONCACHE. To remove this problem enlarge the Icon Cache by making and then doubleclicking the *.REG file described below.
Here is the *.REG-file in text form so it can be posted here. Copy and paste the lines between Start and End into an empty *.txt file. Rename this *.txt to "MaxIcon.reg" using something like windows explorer. Don't care about the warnings from Windows. Doubleclick the file and reboot. Note: The last line *must* be empty and the stuff between the brackets  is one whole long line, your browser may line wrap it here on the BBS. So there are a total of 5 lines in this file.
"Max Cached Icons"="2048"
Do a back up of all your important files, then boot to DOS (do a shutdown / boot to DOS, don't just go to the DOS prompt from within windows) and type exactly these lines, each of them closed by an :
We are getting rid of SHELLICONCACHE.
You need no backup of SHELLICONCACHE, cause Windows will recreate it as soon as it is needed, probably after the next reboot, but it may take some additional reboots. The SHELLICONCACHE has the only function
to temporarily store icons of files.
If the SHELLICONCACHE is corrupted, it cannot be *repaired* by the MaxIcon.Reg. SHELLICONCACHE`*must* be deleted completely, otherwise the MaxIcon.Reg cannot create a new, functioning one.
Of course you can rename the file (it is not a folder), but it has no sense to do so. I delete SHELLICONCACHE on a regular schedule, cause this speeds up Windows 95 and 98.
After that, reboot your computer.
: Also, sometimes the icons in Windows (win 98) switch themselves around. For example: recently all of the JPEG files were using the Real Player icon! One time some of the desktop shortcuts were using graphics I created that weren't even designed to be used as icons! Once all the .wav files were using the Photoshop icon! The list goes on and on...I don't know whether this is in any way connected to the 4-hour crash problem, the icon problem started before it did. Also, about the crashes, sometimes if I'm doing something that doesn't require the computer to "think" (veiwing graphics in Photoshop, Dreamweaver, etc.) then the graphics just get scrambled at the time of the crash. After the crash happens, I am never able to shut down from the Start bar. I usually have to use Ctrl+Alt+Del to restart.