I replaced my Dell D630's old HDD with a Crucial V4 SSD. I've noticed that when browsing the web and streaming videos my computer freezes up and the hard drive activity light goes on for a few seconds then unfreezes. Also, is this read/write good for an SSD or does this mean problem?
XP isn't very SSD friendly. You might want to google XP SSD tweaks to increase your SSD performance. Also, Crucial V4 is a SATA 3 SSD, your D630 most likely only has a SATA 2 port, and that might bottleneck your SSD a little bit. Normally, a SATA 3 SSD should have 400mb/s+ read or write speed.
Not only can Windows XP have issues, but some older computers (the motherboard) can also have issues causing freezing.
Unfortunately, it's unlikely a much older computer would have an updated BIOS to fix this if it's the problem. I suspect it's simply that you're using XP though or else you'd likely get a BSOD if the BIOS is the problem.
Another option is to update XP to Windows 8 Pro (and use Start8 by Stardock for $5). They have a digital download deal for $40 until Jan 31st 2013.
I strongly recommend going with Windows 8 Pro. You WILL have to reinstall all your software though so thoroughly backup.
1. Go to the Windows 8 site and follow the links to the $40 digital download deal
2. Download the ISO image *Note must get 32-bit if XP is 32-bit which is likely
3. BURN THE IMAGE to a DVD and label it (not necessary but recommended)
4. Backup any data and write down the software you use for reinstallation
5. Boot to the DVD of Windows 8 Pro and start the installation
6. Install any missing drivers (mainly video); check "Device Manager" for missing drivers (Google anything that shows up; I had an "unknown media device" so I installed the Ricoh device drivers for the SD card reader for VISTA 32-bit then things worked fine.
7. Install missing programs, import data etc. (*Including START8 from Stardock)
8. DELETE the "old Windows" folder if it exists http://windows.microsoft.com/en-CA/windows-8/how-remove-windows-old-folder (it DID exist when I did this)