Only Virus Scan Available is Boot Scan?

[REDACTED]

I'm working on my Husbands PC running Vista Home Premium.  It was running super slow.  Uninstalled a few things and ran a Quick scan, then uninstalled a few more things, turned off Windows Defender and firewall went in to scan with a boot scan and noticed that the drop down no longer shows deep scan, quick scan, scan a file... it only shows boot scan.

Any ideas on why this happened? 

[Asyn]

Repair Avast:
1. Control Panel -> Add/Remove programs -> Avast
2. Click on 'Repair'.
3. Follow instructions.
4. Reboot.

[REDACTED]

Danke Uber... I'll give that a try tomorrow.  It's 2am right now and I'm mighty tired.   

[Asyn]

You're welcome. Take your time...

[REDACTED]

Sorry it took me so long to get back to this.  I went into control panel and repaired the Avast internet security.  I came back to it today and it still only shows Boot Scan in the drop down menu for the scans. 

Any other suggestions or do I need to remove this and start over?

[Alikhan]

You need to perform a clean install:

Note: It's important you used the stub online installer from the one I linked.. NOT the offline one.

Note: You need to be ONLINE during this install (online installer works in all cases whereas offline sometimes doesn't)

1.Download your version of avast! and the avastclear tool:

Avast Free Antivirus
Avast Pro Antivirus
Avast Internet Security
Avast Premier

Download Avast Clear Tool

2. Uninstall Avast by control panel  [If you don't have Avast in control Panel go to #3]
3. Uninstall in safe mode using Avastclear. [Running Avastclear is normal mode will give a prompt to go into Safe Mode]
Check : Once uninstalled check in device manager>view>show hidden devices if there is anything related to avast with a yellow triangle.. if so, uninstall it and reboot.
5. Install the version you downloaded.
6. Reboot.

Free: If you have the Free version, register the product for free for a year from the avast! UI.
Paid: If you have a paid license, insert the license key/activation code after the reboot at stage 6.

If you have any questions, please don't hesitate to ask. It's better to ask than make a mistake and start over again with the process.