Removing DiscGuard protection

[ee45678]

I am trying to fix an app. (which is protected by DiscGuard) so that it can run without the original CD in the CD drive. I am really sick of changing the CD everytime I want to work with some other CD, also I have already had the CD slip out of hand and fall once and it is only a matter of time when it might get damaged.

A google search brought up only one spanish language tutorial about cracking a rally game and the translation was not good.

Can someone give me a few hints as to how to go about cracking this protection.

It is an app. made using VB6 and has a bunch of dlls made using VC++ 5.
PEid fails to ID the packer but the exe is definitely packed. I don't have Sice so I tried loading it in Olly but it causes an exception during the loading.

So where to now?

[ee45678]

OK people, since no one has responded yet I will tell you what I have so far. Let me also state that I am a newbie in unpacking manually, hey I am a developer not a reverser.

How do I detect whether this app uses DiscGuard:
The following files exist in the installation directory:
IOSLINK.VXD
IOSLINK.SYS

The main exe (xxx.exe) is encrypted and the decryption key is somehow inscribed in the CD, this is how DiscGuard works.

The xxx.exe imports two dlls, T6111.dll and MSVBVM60.DLL.
The xxx.exe imports ordinal functions:
T6111.dll:1
MSVBVM60.DLL:0277h (rtcMidCharBstr)

The T6111.dll exports two functions.
PEid IDs it as "Microsoft Visual C++ DLL Method 1", Linker Info: 5.0, In other words a MSVC 5.0 dll.
The KANAL v2.8 Krypto analyzer plugin reports the followin:
BLOWFISH[sbox]::0002BC48::1202E048
-BLOWFISH: Sbox 2
PI fraction(NIMBUS/BLOWFISH)::0002BC00::1202E000
Fractional part of PI number - 640 bits. Used e.g. in BLOWFISH (pbox & sbox) or NIMBUS (fixed key).

When I try to load the xxx.exe into Olly it lands somewhere inside T6111.dll and reports: Access violation while writing to [004001E4], that probably is where the decrypted code was being writen into the in-memory image of xxx.exe ??. I don't know what to try next.

The very mention of BLOWFISH encryption means that I am out of my league. So, it looks like I need to read some Intro. Tutorials about manually unpacking such exes, any pointers anyone.

And please don't point me to an attachment, I can't download yet.