Windows XP Boot-up Problem

[Evil_Maniac From Mars]

I have Windows XP Pro SP2. I always use a USB mouse. However, last time I went to start up my PC, I got the error pictured below:

(pic unavailable)
Detecting IDE drives ...
PS/2 Mous error or no PS/2 mouse present


Firstly, it took over a minute to do the memory test above, a problem I've never had before, and now happens on a regular basis. It turns up OK nonetheless. Next, it gave me the above error, which I have also never had before. The only change I'd made was to install FSX the night before.

After pressing F1 to continue, I get this:

(pic unavailable)
Verifying DMI Pool Daa ......
DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRES ENTER

I put the boot disk in the drive, and nothing changes. I can't get my computer past this point. Suggestions?

Edit: I fixed the PS2 error by putting my USB into a PS2 adapter. However, Problem #2 still persists.