Helly grays, welcome to PCHF.
The key word in that error there is "memory". Absolutely nothing at all to do with the registry.
Altough it could possibly be a disk problem, RAM is much more likely to cause this error, because RAM is slightly more prone to failure, especially if you have poor quality RAM installed in your PC. Also, RAM is where the temporary memory for your applications are stored. Your HDD is only used if all of your RAM is being used in the form of a "pagefile". How much RAM do you have?
So, the first thing you should check is memory. For this, there is a free utility called memtest.
If you have a floppy drive (easier), then please download and unzip the following:
http://www.memtest86.com/memtest34a.zip
If you have a CD-Writer with Nero (or other ISO writing software), please download, unzip and burn the following:
http://www.memtest86.com/memtest86-3.4a.iso.zip
Once you have installed the above onto either a floppy drive or CD, then restart you PC, and let memtest do it's thing! It can take several hours, and any problems encountered with memory will show up as failing addresses highlighted in red.